Commit 54c6e2dd authored by Krzysztof =?utf-8?Q?Ha=C5=82asa?='s avatar Krzysztof =?utf-8?Q?Ha=C5=82asa?= Committed by Bjorn Helgaas

PCI: Allow a NULL "parent" pointer in pci_bus_assign_domain_nr()

pci_create_root_bus() passes a "parent" pointer to
pci_bus_assign_domain_nr().  When CONFIG_PCI_DOMAINS_GENERIC is defined,
pci_bus_assign_domain_nr() dereferences that pointer.  Many callers of
pci_create_root_bus() supply a NULL "parent" pointer, which leads to a NULL
pointer dereference error.

7c674700 ("PCI: Move domain assignment from arm64 to generic code")
moved the "parent" dereference from arm64 to generic code.  Only arm64 used
that code (because only arm64 defined CONFIG_PCI_DOMAINS_GENERIC), and it
always supplied a valid "parent" pointer.  Other arches supplied NULL
"parent" pointers but didn't defined CONFIG_PCI_DOMAINS_GENERIC, so they
used a no-op version of pci_bus_assign_domain_nr().

8c7d1474 ("ARM/PCI: Move to generic PCI domains") defined
CONFIG_PCI_DOMAINS_GENERIC on ARM, and many ARM platforms use
pci_common_init(), which supplies a NULL "parent" pointer.
These platforms (cns3xxx, dove, footbridge, iop13xx, etc.) crash
with a NULL pointer dereference like this while probing PCI:

  Unable to handle kernel NULL pointer dereference at virtual address 000000a4
  PC is at pci_bus_assign_domain_nr+0x10/0x84
  LR is at pci_create_root_bus+0x48/0x2e4
  Kernel panic - not syncing: Attempted to kill init!

[bhelgaas: changelog, add "Reported:" and "Fixes:" tags]
Reported: http://forum.doozan.com/read.php?2,17868,22070,quote=1
Fixes: 8c7d1474 ("ARM/PCI: Move to generic PCI domains")
Fixes: 7c674700 ("PCI: Move domain assignment from arm64 to generic code")
Signed-off-by: default avatarKrzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
CC: stable@vger.kernel.org	# v4.0+
parent 1195c103
...@@ -4772,8 +4772,10 @@ int pci_get_new_domain_nr(void) ...@@ -4772,8 +4772,10 @@ int pci_get_new_domain_nr(void)
void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
{ {
static int use_dt_domains = -1; static int use_dt_domains = -1;
int domain = of_get_pci_domain_nr(parent->of_node); int domain = -1;
if (parent)
domain = of_get_pci_domain_nr(parent->of_node);
/* /*
* Check DT domain and use_dt_domains values. * Check DT domain and use_dt_domains values.
* *
......
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