• LABBE Corentin's avatar
    rtc: cmos: remove all __exit_p annotations · a3a0673b
    LABBE Corentin authored
    I got the following stack trace under qemu:
    [    7.575243] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
    [    7.596098] IP: [<ffffffff814f5b08>] cmos_set_alarm+0x38/0x280
    [    7.615699] PGD 3ccbe067
    [    7.615923] PUD 3daf2067
    [    7.635156] PMD 0
    [    7.654358] Oops: 0000 [#1] SMP
    [    7.673869] Modules linked in:
    [    7.693235] CPU: 0 PID: 1701 Comm: hwclock Tainted: G        W       4.9.0-rc1+ #24
    [    7.712455] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
    [    7.753569] task: ffff88003d88dc40 task.stack: ffffc90000224000
    [    7.773743] RIP: 0010:[<ffffffff814f5b08>]  [<ffffffff814f5b08>] cmos_set_alarm+0x38/0x280
    [    7.794893] RSP: 0018:ffffc90000227c10  EFLAGS: 00010296
    [    7.815890] RAX: 000000000000001d RBX: ffffc90000227d28 RCX: ffffffff8182be78
    [    7.836057] RDX: 0000000000000001 RSI: 0000000000000202 RDI: 0000000000000202
    [    7.856612] RBP: ffffc90000227c48 R08: 0000000000000000 R09: 0000000000000001
    [    7.877561] R10: 00000000000001c0 R11: 00000000000001c0 R12: 0000000000000000
    [    7.897072] R13: ffff88003d96f400 R14: ffff88003dac6410 R15: ffff88003dac6420
    [    7.917403] FS:  00007f77f42d9700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
    [    7.938293] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [    7.958364] CR2: 0000000000000010 CR3: 000000003ccbb000 CR4: 00000000000006f0
    [    7.978028] Stack:
    [    7.997120]  ffff88003dac6000 ffff88003dac6410 0000000058049d01 ffffc90000227d28
    [    8.016993]  ffff88003dac6000 ffff88003dac6410 ffff88003dac6420 ffffc90000227c98
    [    8.039505]  ffffffff814f225d 0000001800227c98 000000090000002a 0000000900000011
    [    8.059985] Call Trace:
    [    8.080110]  [<ffffffff814f225d>] __rtc_set_alarm+0x8d/0xa0
    [    8.099421]  [<ffffffff814f2389>] rtc_timer_enqueue+0x119/0x190
    [    8.119925]  [<ffffffff814f2e6e>] rtc_update_irq_enable+0xbe/0x100
    [    8.140583]  [<ffffffff814f3bb0>] rtc_dev_ioctl+0x3c0/0x480
    [    8.161162]  [<ffffffff81146b6a>] ? user_path_at_empty+0x3a/0x50
    [    8.182717]  [<ffffffff8114aa36>] do_vfs_ioctl+0x96/0x5c0
    [    8.204624]  [<ffffffff8113e066>] ? vfs_stat+0x16/0x20
    [    8.225994]  [<ffffffff8113e135>] ? SyS_newstat+0x15/0x30
    [    8.247043]  [<ffffffff8114afa7>] SyS_ioctl+0x47/0x80
    [    8.267191]  [<ffffffff815f5c77>] entry_SYSCALL_64_fastpath+0x1a/0xa9
    [    8.288719] Code: 6a 81 48 89 e5 41 57 41 56 41 55 49 89 fd 41 54 53 48 89 f3 48 c7 c6 20 c4 78 81 48 83 ec 10 e8 8f 00 ef ff 4d 8b a5 a0 00 00 00 <41> 8b 44 24 10 85 c0 0f 8e 2b 02 00 00 4c 89 ef 31 c0 b9 53 01
    [    8.335233] RIP  [<ffffffff814f5b08>] cmos_set_alarm+0x38/0x280
    [    8.357096]  RSP <ffffc90000227c10>
    [    8.379051] CR2: 0000000000000010
    [    8.401736] ---[ end trace 5cbcd83a1f225ed3 ]---
    
    This occur only when CONFIG_DEBUG_TEST_DRIVER_REMOVE is enabled and
    CONFIG_RTC_DRV_CMOS builtin.
    
    When cmos_set_alarm() is called dev is NULL and so trigger the deref via
    cmos->irq
    
    The problem comes from that the device is removed but no remove function
    are called due to _exit_p().
    
    This patch remove all _exit_p() annotation.
    Signed-off-by: default avatarCorentin Labbe <clabbe.montjoie@gmail.com>
    Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
    a3a0673b
rtc-cmos.c 32.6 KB