1. 18 Jun, 2016 1 commit
    • Chris Wilson's avatar
      drm: Protect drm_connector_register_all() under DRIVER_MODESET · bee7fb15
      Chris Wilson authored
      0-day kbuilder found
      
      [    1.360244] BUG: unable to handle kernel NULL pointer dereference at   (null)
      [    1.360972] IP: [<c14db9ad>] mutex_lock_nested+0x11f/0x2c3
      [    1.361512] *pde = 00000000
      [    1.361827] Oops: 0002 [#1]
      [    1.362123] Modules linked in:
      [    1.362451] CPU: 0 PID: 1 Comm: swapper Not tainted 4.7.0-rc2-00564-ge28cd4d0 #1
      [    1.363202] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
      [    1.364105] task: c03d0000 ti: d28da000 task.ti: d28da000
      [    1.364636] EIP: 0060:[<c14db9ad>] EFLAGS: 00210096 CPU: 0
      [    1.365215] EIP is at mutex_lock_nested+0x11f/0x2c3
      [    1.365703] EAX: 00000000 EBX: d39e8ae8 ECX: d39e8b14 EDX: c1361cf9
      [    1.366351] ESI: c03d0000 EDI: d28dbed0 EBP: d28dbeec ESP: d28dbec0
      [    1.367010]  DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
      [    1.367534] CR0: 80050033 CR2: 00000000 CR3: 019a9000 CR4: 00000690
      [    1.368152] Stack:
      [    1.368356]  d39e8b14 d39e8b24 c1361cf9 00200246 d39e8b14 00000000 11111111 d28dbed0
      [    1.369235]  d39e8800 d39e8ae8 00000000 d28dbf08 c1361cf9 d28dbf0c c10b25be d39e8800
      [    1.370087]  00000000 00000000 d28dbf1c c135e37d fffffff4 ffffffff 00000000 d28dbf28
      [    1.371012] Call Trace:
      [    1.371272]  [<c1361cf9>] ? drm_connector_register_all+0x1a/0x92
      [    1.371847]  [<c1361cf9>] drm_connector_register_all+0x1a/0x92
      [    1.372421]  [<c10b25be>] ? kstrdup+0x25/0x3a
      [    1.372863]  [<c135e37d>] drm_dev_register+0x59/0x99
      [    1.373358]  [<c195ea3e>] vgem_init+0x34/0x49
      [    1.373770]  [<c195ea0a>] ? mipi_dsi_bus_init+0xf/0xf
      [    1.374257]  [<c100048f>] do_one_initcall+0x7c/0xfd
      [    1.374754]  [<c104b409>] ? parse_args+0x1fd/0x314
      [    1.375259]  [<c1939c10>] ? kernel_init_freeable+0xd0/0x179
      [    1.375837]  [<c1939c2c>] kernel_init_freeable+0xec/0x179
      [    1.376371]  [<c14d66ea>] kernel_init+0x8/0xcb
      [    1.376806]  [<c14debce>] ret_from_kernel_thread+0xe/0x30
      [    1.377322]  [<c14d66e2>] ? rest_init+0x10e/0x10e
      [    1.377754] Code: 89 fa e8 71 c5 b7 ff 8b 4e 04 89 fa 89 d8 e8 8e c6 b7 ff 8d 43 2c 89 45 d4 8b 43 30 8d 4b 2c 89 45 e8 89 7b 30 89 4d e4 8b 55 dc <89> 38 8d 43 3c 89 75 ec e8 c9 dd b7 ff eb 0c 31 c0 87 03 48
      +75
      [    1.380442] EIP: [<c14db9ad>] mutex_lock_nested+0x11f/0x2c3 SS:ESP 0068:d28dbec0
      [    1.381174] CR2: 0000000000000000
      
      when loading the non-modesetting vGEM module. To prevent use of the
      uninitialised dev->mode_config from drm_dev_register() we move the
      drm_connector_register_all() under a DRIVER_MODESET guard. Longer term,
      we probably want to initialise the embedded dev->mode_config automatically
      from drm_dev_init() for all DRIVER_MODESET drivers.
      
      v2: Also protect drm_dev_unregister.
      
      Fixes: e28cd4d0 ("drm: Automatically register/unregister all connectors")
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
      Cc: Emil Velikov <emil.l.velikov@gmail.com>
      Cc: dri-devel@lists.freedesktop.org
      Reviewed-by: default avatarEmil Velikov <emil.l.velikov@gmail.com>
      Testcase: igt/vgem_reload_basic
      Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
      Link: http://patchwork.freedesktop.org/patch/msgid/1466257601-5656-1-git-send-email-chris@chris-wilson.co.uk
      bee7fb15
  2. 17 Jun, 2016 9 commits
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