In the allocation loop, "pages" will never become zero (because of the
DIV_ROUND_UP), so if we can't allocate any size and pages becomes 1,
we will keep trying to allocate 1 page until it succeeds.  And in that
case, as coverity reported, block will never be NULL.
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487402 ("Control flow issues")
Fixes: 14124b25 ("iwlwifi: dbg_ini: implement monitor allocation flow")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Fixes: 14124b25 ("iwlwifi: dbg_ini: implement monitor allocation flow")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

As noted in the previous commit, due to the way we allocate the
dev_cmd headers with 324 byte size, and 4/8 byte alignment, the
part we use of them (bytes 20..40-68) could still cross a page
and thus 2^32 boundary.

Address this by using alignment to ensure that the allocation
cannot cross a page boundary, on hardware that's affected. To
make that not cause more memory consumption, reduce the size of
the allocations to the necessary size - we go from 324 bytes in
each allocation to 60/68 on gen2 depending on family, and ~120
or so on gen1 (so on gen1 it's a pure reduction in size, since
we don't need alignment there).

To avoid size and clearing issues, add a new structure that's
just the header, and use kmem_cache_zalloc().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

Warn if the DMA bug is going to happen. We don't have a good
way of actually aborting in this case and we have workarounds
in place for the cases where it happens, but in order to not
be surprised add a safety-check and warn.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

There's a hardware bug in the flow handler (DMA engine), if the
address + len of some TB wraps around a 2^32 boundary, the carry
bit is then carried over into the next TB.

Work around this by copying the data to a new page when we find
this situation, and then copy it in a way that we cannot hit the
very end of the page.

To be able to free the new page again later we need to chain it
to the TSO page, use the last pointer there to make sure we can
never use the page fully for DMA, and thus cannot cause the same
overflow situation on this page.

This leaves a few potential places (where we didn't observe the
problem) unaddressed:
 * The second TB could reach or cross the end of a page (and thus
   2^32) due to the way we allocate the dev_cmd for the header
 * For host commands, a similar thing could happen since they're
   just kmalloc().
We'll address these in further commits.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

Move the tracking that records the page in the SKB for later
free (refcount decrement) into the get_page_hdr() function
for better code reuse.

While at it, also add an assertion that this doesn't overwrite
any existing page pointer in the skb.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

we should not send the PPAG (Per-Platform Antenna Gain)
command to FW unless the platform has this ACPI table and it was
read and validated during the init flow. also no need to send the
command if the feature is disabled, so check if enabled before
sending, as if there is no valid table the feature is disabled.
Signed-off-by: Gil Adam <gil.adam@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

My RedHat email address does not work any longer. Change to my private one.
Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

add_ie_rates() copys rates without checking the length
in bss descriptor from remote AP.when victim connects to
remote attacker, this may trigger buffer overflow.
lbs_ibss_join_existing() copys rates without checking the length
in bss descriptor from remote IBSS node.when victim connects to
remote attacker, this may trigger buffer overflow.
Fix them by putting the length check before performing copy.

This fix addresses CVE-2019-14896 and CVE-2019-14897.
This also fix build warning of mixed declarations and code.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Wen Huang <huangwenabc@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

The sband->bitrates[] array has "sband->n_bitrates" elements so this
check needs to be >= instead of > or we could read beyond the end of the
array.

These values come from when we call mt76_register_device():

	ret = mt76_register_device(&dev->mt76, true, mt7603_rates,
				   ARRAY_SIZE(mt7603_rates));

Here sband->bitrates[] is mt7603_rates[] and ->n_bitrates is the
ARRAY_SIZE()

Fixes: 5ce09c1a ("mt76: track rx airtime for airtime fairness and survey")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

The mt76_led_cleanup() function is called unconditionally, which
leads to a link error when CONFIG_LEDS is a loadable module or
disabled but mt76 is built-in:

drivers/net/wireless/mediatek/mt76/mac80211.o: In function `mt76_unregister_device':
mac80211.c:(.text+0x2ac): undefined reference to `led_classdev_unregister'

Use the same trick that is guarding the registration, using an
IS_ENABLED() check for the CONFIG_MT76_LEDS symbol that indicates
whether LEDs can be used or not.

Fixes: 36f7e2b2 ("mt76: do not use devm API for led classdev")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Dev_hold has to be called always in rx_queue_add_kobject.
Otherwise usage count drops below 0 in case of failure in
kobject_init_and_add.

Fixes: b8eb7183 ("net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject")
Reported-by: syzbot <syzbot+30209ea299c09d8785c9@syzkaller.appspotmail.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: David Miller <davem@davemloft.net>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Jouni Hogander <jouni.hogander@unikie.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

As flower rules are added, they are given a stats ID based on the number
of rules that can be supported in firmware. Only after the initial
allocation of all available IDs does the driver begin to reuse those that
have been released.

The initial allocation of IDs was modified to account for multiple memory
units on the offloaded device. However, this introduced a bug whereby the
counter that controls the IDs could be decremented before the ID was
assigned (where it is further decremented). This means that the stats ID
could be assigned as -1/0xfffffff which is out of range.

Fix this by only decrementing the main counter after the current ID has
been assigned.

Fixes: 467322e2 ("nfp: flower: support multiple memory units for filter offloads")
Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

dsa_link_touch() is not exported, or defined outside of the
file it is in so make it static to avoid the following warning:

net/dsa/dsa2.c:127:17: warning: symbol 'dsa_link_touch' was not declared. Should it be static?
Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/atheros/ag71xx.c: In function 'ag71xx_probe':
drivers/net/ethernet/atheros/ag71xx.c:1776:30: warning: passing argument 2 of
 'of_get_phy_mode' makes pointer from integer without a cast [-Wint-conversion]
In file included from drivers/net/ethernet/atheros/ag71xx.c:33:
./include/linux/of_net.h:15:69: note: expected 'phy_interface_t *'
 {aka 'enum <anonymous> *'} but argument is of type 'int'

Fixes: 0c65b2b9 ("net: of_get_phy_mode: Change API to solve int/unit warnings")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix missing '*' kernel-doc notation that causes this warning:

../include/linux/netdevice.h:1779: warning: bad line:                                 spinlock

Fixes: ab92d68f ("net: core: add generic lockdep keys")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

sk->sk_pacing_shift can be read and written without lock
synchronization. This patch adds annotations to
document this fact and avoid future syzbot complains.

This might also avoid unexpected false sharing
in sk_pacing_shift_update(), as the compiler
could remove the conditional check and always
write over sk->sk_pacing_shift :

if (sk->sk_pacing_shift != val)
	sk->sk_pacing_shift = val;
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

ql_alloc_large_buffers() has the usual RX buffer allocation
loop where it allocates skbs and maps them for DMA.  It also
treats failure as a fatal error.

There are (at least) three bugs in the error paths:

1. ql_free_large_buffers() assumes that the lrg_buf[] entry for the
first buffer that couldn't be allocated will have .skb == NULL.
But the qla_buf[] array is not zero-initialised.

2. ql_free_large_buffers() DMA-unmaps all skbs in lrg_buf[].  This is
incorrect for the last allocated skb, if DMA mapping failed.

3. Commit 1acb8f2a ("net: qlogic: Fix memory leak in
ql_alloc_large_buffers") added a direct call to dev_kfree_skb_any()
after the skb is recorded in lrg_buf[], so ql_free_large_buffers()
will double-free it.

The bugs are somewhat inter-twined, so fix them all at once:

* Clear each entry in qla_buf[] before attempting to allocate
  an skb for it.  This goes half-way to fixing bug 1.
* Set the .skb field only after the skb is DMA-mapped.  This
  fixes the rest.

Fixes: 1357bfcf ("qla3xxx: Dynamically size the rx buffer queue ...")
Fixes: 0f8ab89e ("qla3xxx: Check return code from pci_map_single() ...")
Fixes: 1acb8f2a ("net: qlogic: Fix memory leak in ql_alloc_large_buffers")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

syzbot reported a memory leak when an allocation fails within
genradix_prealloc() for output streams. That's because
genradix_prealloc() leaves initialized members initialized when the
issue happens and SCTP stack will abort the current initialization but
without cleaning up such members.

The fix here is to always call genradix_free() when genradix_prealloc()
fails, for output and also input streams, as it suffers from the same
issue.

Reported-by: syzbot+772d9e36c490b18d51d1@syzkaller.appspotmail.com
Fixes: 2075e50c ("sctp: convert to genradix")
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'wireless-drivers-2019-12-17' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers

Kalle Valo says:

====================
wireless-drivers fixes for v5.5

First set of fixes for v5.5. Fixing security issues, some regressions
and few major bugs.

mwifiex

* security fix for handling country Information Elements (CVE-2019-14895)

* security fix for handling TDLS Information Elements

ath9k

* fix endian issue with ath9k_pci_owl_loader

mt76

* fix default mac address handling

iwlwifi

* fix merge damage which lead to firmware crashing during boot on some devices

* fix device initialisation regression on some devices
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Upon reusing the ptp_qoriq driver, the ptp_qoriq_free() function was
used on the remove path to free any allocated resources.
The ptp_qoriq IRQ is among these resources that are freed in
ptp_qoriq_free() even though it is also a managed one (allocated using
devm_request_threaded_irq).

Drop the resource managed version of requesting the IRQ in order to not
trigger a double free of the interrupt as below:

[  226.731005] Trying to free already-free IRQ 126
[  226.735533] WARNING: CPU: 6 PID: 749 at kernel/irq/manage.c:1707
__free_irq+0x9c/0x2b8
[  226.743435] Modules linked in:
[  226.746480] CPU: 6 PID: 749 Comm: bash Tainted: G        W
5.4.0-03629-gfd7102c32b2c-dirty #912
[  226.755857] Hardware name: NXP Layerscape LX2160ARDB (DT)
[  226.761244] pstate: 40000085 (nZcv daIf -PAN -UAO)
[  226.766022] pc : __free_irq+0x9c/0x2b8
[  226.769758] lr : __free_irq+0x9c/0x2b8
[  226.773493] sp : ffff8000125039f0
(...)
[  226.856275] Call trace:
[  226.858710]  __free_irq+0x9c/0x2b8
[  226.862098]  free_irq+0x30/0x70
[  226.865229]  devm_irq_release+0x14/0x20
[  226.869054]  release_nodes+0x1b0/0x220
[  226.872790]  devres_release_all+0x34/0x50
[  226.876790]  device_release_driver_internal+0x100/0x1c0

Fixes: d346c9e8 ("dpaa2-ptp: reuse ptp_qoriq driver")
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'mac80211-for-net-2019-10-16' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
A handful of fixes:
 * disable AQL on most drivers, addressing the iwlwifi issues
 * fix double-free on network namespace changes
 * fix TID field in frames injected through monitor interfaces
 * fix ieee80211_calc_rx_airtime()
 * fix NULL pointer dereference in rfkill (and remove BUG_ON)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Selecting MSCC_OCELOT_SWITCH is not possible when NET_VENDOR_MICROSEMI
is disabled:

WARNING: unmet direct dependencies detected for MSCC_OCELOT_SWITCH
  Depends on [n]: NETDEVICES [=y] && ETHERNET [=n] && NET_VENDOR_MICROSEMI [=n] && NET_SWITCHDEV [=y] && HAS_IOMEM [=y]
  Selected by [m]:
  - NET_DSA_MSCC_FELIX [=m] && NETDEVICES [=y] && HAVE_NET_DSA [=y] && NET_DSA [=y] && PCI [=y]

Add a Kconfig dependency on NET_VENDOR_MICROSEMI, which also implies
CONFIG_NETDEVICES.

Depending on a vendor config violates menuconfig locality for the DSA
driver, but is the smallest compromise since all other solutions are
much more complicated (see [0]).

https://www.spinics.net/lists/netdev/msg618808.html

Fixes: 56051948 ("net: dsa: ocelot: add driver for Felix switch family")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mao Wenan <maowenan@huawei.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In the implementation of gmac_setup_txqs() the allocated desc_ring is
leaked if TX queue base is not aligned. Release it via
dma_free_coherent.

Fixes: 4d5ae32f ("net: ethernet: Add a driver for Gemini gigabit ethernet")
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

There were several issues with 53568438 ("net: dsa: b53: Add support for port_egress_floods callback") that resulted in breaking connectivity for standalone ports:

- both user and CPU ports must allow unicast and multicast forwarding by
  default otherwise this just flat out breaks connectivity for
  standalone DSA ports
- IP multicast is treated similarly as multicast, but has separate
  control registers
- the UC, MC and IPMC lookup failure register offsets were wrong, and
  instead used bit values that are meaningful for the
  B53_IP_MULTICAST_CTRL register

Fixes: 53568438 ("net: dsa: b53: Add support for port_egress_floods callback")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Stefano Garzarella says:

====================
vsock/virtio: fix null-pointer dereference and related precautions

This series mainly solves a possible null-pointer dereference in
virtio_transport_recv_listen() introduced with the multi-transport
support [PATCH 1].

PATCH 2 adds a WARN_ON check for the same potential issue
and a returned error in the virtio_transport_send_pkt_info() function
to avoid crashing the kernel.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

virtio_transport_get_ops() and virtio_transport_send_pkt_info()
can only be used on connecting/connected sockets, since a socket
assigned to a transport is required.

This patch adds a WARN_ON() on virtio_transport_get_ops() to check
this requirement, a comment and a returned error on
virtio_transport_send_pkt_info(),
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

With multi-transport support, listener sockets are not bound to any
transport. So, calling virtio_transport_reset(), when an error
occurs, on a listener socket produces the following null-pointer
dereference:

  BUG: kernel NULL pointer dereference, address: 00000000000000e8
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 0 P4D 0
  Oops: 0000 [#1] SMP PTI
  CPU: 0 PID: 20 Comm: kworker/0:1 Not tainted 5.5.0-rc1-ste-00003-gb4be21f316ac-dirty #56
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014
  Workqueue: virtio_vsock virtio_transport_rx_work [vmw_vsock_virtio_transport]
  RIP: 0010:virtio_transport_send_pkt_info+0x20/0x130 [vmw_vsock_virtio_transport_common]
  Code: 1f 84 00 00 00 00 00 0f 1f 00 55 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 fc 53 48 83 ec 10 44 8b 76 20 e8 c0 ba fe ff <48> 8b 80 e8 00 00 00 e8 64 e3 7d c1 45 8b 45 00 41 8b 8c 24 d4 02
  RSP: 0018:ffffc900000b7d08 EFLAGS: 00010282
  RAX: 0000000000000000 RBX: ffff88807bf12728 RCX: 0000000000000000
  RDX: ffff88807bf12700 RSI: ffffc900000b7d50 RDI: ffff888035c84000
  RBP: ffffc900000b7d40 R08: ffff888035c84000 R09: ffffc900000b7d08
  R10: ffff8880781de800 R11: 0000000000000018 R12: ffff888035c84000
  R13: ffffc900000b7d50 R14: 0000000000000000 R15: ffff88807bf12724
  FS:  0000000000000000(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00000000000000e8 CR3: 00000000790f4004 CR4: 0000000000160ef0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   virtio_transport_reset+0x59/0x70 [vmw_vsock_virtio_transport_common]
   virtio_transport_recv_pkt+0x5bb/0xe50 [vmw_vsock_virtio_transport_common]
   ? detach_buf_split+0xf1/0x130
   virtio_transport_rx_work+0xba/0x130 [vmw_vsock_virtio_transport]
   process_one_work+0x1c0/0x300
   worker_thread+0x45/0x3c0
   kthread+0xfc/0x130
   ? current_work+0x40/0x40
   ? kthread_park+0x90/0x90
   ret_from_fork+0x35/0x40
  Modules linked in: sunrpc kvm_intel kvm vmw_vsock_virtio_transport vmw_vsock_virtio_transport_common irqbypass vsock virtio_rng rng_core
  CR2: 00000000000000e8
  ---[ end trace e75400e2ea2fa824 ]---

This happens because virtio_transport_reset() calls
virtio_transport_send_pkt_info() that can be used only on
connecting/connected sockets.

This patch fixes the issue, using virtio_transport_reset_no_sock()
instead of virtio_transport_reset() when we are handling a listener
socket.

Fixes: c0cfa2d8 ("vsock: add multi-transports support")
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In rfkill_register, the struct rfkill pointer is first derefernced
and then checked for NULL. This patch removes the BUG_ON and returns
an error to the caller in case rfkill is NULL.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Link: https://lore.kernel.org/r/20191215153409.21696-1-pakki001@umn.eduSigned-off-by: Johannes Berg <johannes.berg@intel.com>

In function xenvif_disconnect_queue(), the value of queue->rx_irq is
zeroed *before* queue->task is stopped. Unfortunately that task may call
notify_remote_via_irq(queue->rx_irq) and calling that function with a
zero value results in a NULL pointer dereference in evtchn_from_irq().

This patch simply re-orders things, stopping all tasks before zero-ing the
irq values, thereby avoiding the possibility of the race.

Fixes: 2ac061ce ("xen/netback: cleanup init and deinit code")
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

Display the return code as decimal integer.

Fixes: 55d7de9d ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

The sge_info debugfs collects offload queue info even when offload
capability is disabled and leads to panic.

[  144.139871] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  144.139874] CR2: 0000000000000000 CR3: 000000082d456005 CR4: 00000000001606e0
[  144.139876] Call Trace:
[  144.139887]  sge_queue_start+0x12/0x30 [cxgb4]
[  144.139897]  seq_read+0x1d4/0x3d0
[  144.139906]  full_proxy_read+0x50/0x70
[  144.139913]  vfs_read+0x89/0x140
[  144.139916]  ksys_read+0x55/0xd0
[  144.139924]  do_syscall_64+0x5b/0x1d0
[  144.139933]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  144.139936] RIP: 0033:0x7f4b01493990

Fix this crash by skipping the offload queue access in sge_qinfo when
offload capability is disabled
Signed-off-by: Herat Ramani <herat@chelsio.com>
Signed-off-by: Vishal Kulkarni <vishal@chelsio.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

FASTOPEN setsockopt() or sendmsg() may switch the SMC socket to fallback
mode. Once fallback mode is active, the native TCP socket functions are
called. Nevertheless there is a small race window, when FASTOPEN
setsockopt/sendmsg runs in parallel to a connect(), and switch the
socket into fallback mode before connect() takes the sock lock.
Make sure the SMC-specific connect setup is omitted in this case.

This way a syzbot-reported refcount problem is fixed, triggered by
different threads running non-blocking connect() and FASTOPEN_KEY
setsockopt.

Reported-by: syzbot+96d3f9ff6a86d37e44c8@syzkaller.appspotmail.com
Fixes: 6d6dd528 ("net/smc: fix refcount non-blocking connect() -part 2")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

A mismerge between the following two commits:

c6787263 ("net: phylink: ensure consistent phy interface mode")
27755ff8 ("net: phylink: Add phylink_mac_link_{up, down} wrapper functions")

resulted in the wrong interface being passed to the mac_link_up()
function. Fix this up.

Fixes: b4b12b0d ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

This test only works when [1] is applied, which was rejected.

Basically, the errors are reported and cleared. In this particular case of
tls sockets, following reads will block.

The test case was originally submitted with the rejected patch, but, then,
was included as part of a different patchset, possibly by mistake.

[1] https://lore.kernel.org/netdev/20191007035323.4360-2-jakub.kicinski@netronome.com/#t

Thanks Paolo Pisati for pointing out the original patchset where this
appeared.

Fixes: 65190f77 (selftests/tls: add a test for fragmented messages)
Reported-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

Taehee Yoo says:

====================
gtp: fix several bugs in gtp module

This patchset fixes several bugs in the GTP module.

1. Do not allow adding duplicate TID and ms_addr pdp context.
In the current code, duplicate TID and ms_addr pdp context could be added.
So, RX and TX path could find correct pdp context.

2. Fix wrong condition in ->dumpit() callback.
->dumpit() callback is re-called if dump packet size is too big.
So, before return, it saves last position and then restart from
last dump position.
TID value is used to find last dump position.
GTP module allows adding zero TID value. But ->dumpit() callback ignores
zero TID value.
So, dump would not work correctly if dump packet size too big.

3. Fix use-after-free in ipv4_pdp_find().
RX and TX patch always uses gtp->tid_hash and gtp->addr_hash.
but while packet processing, these hash pointer would be freed.
So, use-after-free would occur.

4. Fix panic because of zero size hashtable
GTP hashtable size could be set by user-space.
If hashsize is set to 0, hashtable will not work and panic will occur.
====================
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

GTP default hashtable size is 1024 and userspace could set specific
hashtable size with IFLA_GTP_PDP_HASHSIZE. If hashtable size is set to 0
from userspace,  hashtable will not work and panic will occur.

Fixes: 459aa660 ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

ipv4_pdp_find() is called in TX packet path of GTP.
ipv4_pdp_find() internally uses gtp->tid_hash to lookup pdp context.
In the current code, gtp->tid_hash and gtp->addr_hash are freed by
->dellink(), which is gtp_dellink().
But gtp_dellink() would be called while packets are processing.
So, gtp_dellink() should not free gtp->tid_hash and gtp->addr_hash.
Instead, dev->priv_destructor() would be used because this callback
is called after all packet processing safely.

Test commands:
    ip link add veth1 type veth peer name veth2
    ip a a 172.0.0.1/24 dev veth1
    ip link set veth1 up
    ip a a 172.99.0.1/32 dev lo

    gtp-link add gtp1 &

    gtp-tunnel add gtp1 v1 200 100 172.99.0.2 172.0.0.2
    ip r a  172.99.0.2/32 dev gtp1
    ip link set gtp1 mtu 1500

    ip netns add ns2
    ip link set veth2 netns ns2
    ip netns exec ns2 ip a a 172.0.0.2/24 dev veth2
    ip netns exec ns2 ip link set veth2 up
    ip netns exec ns2 ip a a 172.99.0.2/32 dev lo
    ip netns exec ns2 ip link set lo up

    ip netns exec ns2 gtp-link add gtp2 &
    ip netns exec ns2 gtp-tunnel add gtp2 v1 100 200 172.99.0.1 172.0.0.1
    ip netns exec ns2 ip r a 172.99.0.1/32 dev gtp2
    ip netns exec ns2 ip link set gtp2 mtu 1500

    hping3 172.99.0.2 -2 --flood &
    ip link del gtp1

Splat looks like:
[   72.568081][ T1195] BUG: KASAN: use-after-free in ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[   72.568916][ T1195] Read of size 8 at addr ffff8880b9a35d28 by task hping3/1195
[   72.569631][ T1195]
[   72.569861][ T1195] CPU: 2 PID: 1195 Comm: hping3 Not tainted 5.5.0-rc1 #199
[   72.570547][ T1195] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[   72.571438][ T1195] Call Trace:
[   72.571764][ T1195]  dump_stack+0x96/0xdb
[   72.572171][ T1195]  ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[   72.572761][ T1195]  print_address_description.constprop.5+0x1be/0x360
[   72.573400][ T1195]  ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[   72.573971][ T1195]  ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[   72.574544][ T1195]  __kasan_report+0x12a/0x16f
[   72.575014][ T1195]  ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[   72.575593][ T1195]  kasan_report+0xe/0x20
[   72.576004][ T1195]  ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[   72.576577][ T1195]  gtp_build_skb_ip4+0x199/0x1420 [gtp]
[ ... ]
[   72.647671][ T1195] BUG: unable to handle page fault for address: ffff8880b9a35d28
[   72.648512][ T1195] #PF: supervisor read access in kernel mode
[   72.649158][ T1195] #PF: error_code(0x0000) - not-present page
[   72.649849][ T1195] PGD a6c01067 P4D a6c01067 PUD 11fb07067 PMD 11f939067 PTE 800fffff465ca060
[   72.652958][ T1195] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[   72.653834][ T1195] CPU: 2 PID: 1195 Comm: hping3 Tainted: G    B             5.5.0-rc1 #199
[   72.668062][ T1195] RIP: 0010:ipv4_pdp_find.isra.12+0x86/0x170 [gtp]
[ ... ]
[   72.679168][ T1195] Call Trace:
[   72.679603][ T1195]  gtp_build_skb_ip4+0x199/0x1420 [gtp]
[   72.681915][ T1195]  ? ipv4_pdp_find.isra.12+0x170/0x170 [gtp]
[   72.682513][ T1195]  ? lock_acquire+0x164/0x3b0
[   72.682966][ T1195]  ? gtp_dev_xmit+0x35e/0x890 [gtp]
[   72.683481][ T1195]  gtp_dev_xmit+0x3c2/0x890 [gtp]
[ ... ]

Fixes: 459aa660 ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

gtp_genl_dump_pdp() is ->dumpit() callback of GTP module and it is used
to dump pdp contexts. it would be re-executed because of dump packet size.

If dump packet size is too big, it saves current dump pointer
(gtp interface pointer, bucket, TID value) then it restarts dump from
last pointer.
Current GTP code allows adding zero TID pdp context but dump code
ignores zero TID value. So, last dump pointer will not be found.

In addition, this patch adds missing rcu_read_lock() in
gtp_genl_dump_pdp().

Fixes: 459aa660 ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

GTP RX packet path lookups pdp context with TID. If duplicate TID pdp
contexts are existing in the list, it couldn't select correct pdp context.
So, TID value  should be unique.
GTP TX packet path lookups pdp context with ms_addr. If duplicate ms_addr pdp
contexts are existing in the list, it couldn't select correct pdp context.
So, ms_addr value should be unique.

Fixes: 459aa660 ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

After the recent fix in commit 1899bb32 ("bonding: fix state
transition issue in link monitoring"), the active-backup mode with
miimon initially come-up fine but after a link-failure, both members
transition into backup state.

Following steps to reproduce the scenario (eth1 and eth2 are the
slaves of the bond):

    ip link set eth1 up
    ip link set eth2 down
    sleep 1
    ip link set eth2 up
    ip link set eth1 down
    cat /sys/class/net/eth1/bonding_slave/state
    cat /sys/class/net/eth2/bonding_slave/state

Fixes: 1899bb32 ("bonding: fix state transition issue in link monitoring")
CC: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>