diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-07-26 09:50:31 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-07-26 12:53:17 +0100 |
| commit | 52dda80d62dff39979fb407d67b7c9fc02381589 (patch) | |
| tree | d17419785fbeddc73b8dc248c1767e0c8b91016a /drivers/gpu/drm/i915/intel_guc.c | |
| parent | d899aceb60912c9f1d7e1d7a3b388f116baf1b44 (diff) | |
drm/i915: Protect guc_fini_wq() against module load abort
Prevent
[ 397.873143] general protection fault: 0000 [#1] PREEMPT SMP PTI
[ 397.873154] CPU: 4 PID: 4799 Comm: drv_module_relo Tainted: G U 4.18.0-rc6-CI-CI_DRM_4534+ #1
[ 397.873162] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.10 12/28/2017
[ 397.873175] RIP: 0010:__lock_acquire+0xf6/0x1b50
[ 397.873179] Code: 85 c0 4c 8b 9d 40 ff ff ff 8b 8d 38 ff ff ff 44 8b 8d 30 ff ff ff 4c 8b 85 28 ff ff ff 44 8b 95 24 ff ff ff 0f 84 54 03 00 00 <f0> ff 80 38 01 00 00 8b 15 45 8c 59 02 45 8b bc 24 70 08 00 00 85
[ 397.873240] RSP: 0018:ffffc90000497b40 EFLAGS: 00010002
[ 397.873246] RAX: 6b6b6b6b6b6b6b6b RBX: 0000000000000001 RCX: 0000000000000000
[ 397.873252] RDX: 0000000000000046 RSI: 0000000000000000 RDI: 0000000000000000
[ 397.873258] RBP: ffffc90000497c20 R08: ffffffff810a25e9 R09: 0000000000000000
[ 397.873264] R10: 0000000000000000 R11: ffff880255c63c28 R12: ffff8801093b2840
[ 397.873270] R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000246
[ 397.873277] FS: 00007faf88d71980(0000) GS:ffff880266300000(0000) knlGS:0000000000000000
[ 397.873284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 397.873289] CR2: 000055d866c9ca10 CR3: 000000025472e006 CR4: 00000000003606e0
[ 397.873295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 397.873301] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 397.873308] Call Trace:
[ 397.873318] ? lock_acquire+0xa6/0x210
[ 397.873323] lock_acquire+0xa6/0x210
[ 397.873331] ? drain_workqueue+0x19/0x180
[ 397.873339] __mutex_lock+0x89/0x980
[ 397.873346] ? drain_workqueue+0x19/0x180
[ 397.873352] ? _raw_spin_unlock_irqrestore+0x4c/0x60
[ 397.873359] ? trace_hardirqs_on_caller+0xe0/0x1b0
[ 397.873365] ? drain_workqueue+0x19/0x180
[ 397.873373] ? debug_object_active_state+0x127/0x150
[ 397.873381] ? drain_workqueue+0x19/0x180
[ 397.873387] drain_workqueue+0x19/0x180
[ 397.873395] destroy_workqueue+0x12/0x1f0
[ 397.873476] intel_guc_fini_misc+0x36/0x90 [i915]
[ 397.873540] i915_gem_fini+0x91/0x100 [i915]
[ 397.873588] i915_driver_unload+0xd2/0x110 [i915]
[ 397.873638] i915_pci_remove+0x19/0x30 [i915]
[ 397.873646] pci_device_remove+0x36/0xb0
[ 397.873653] device_release_driver_internal+0x185/0x250
[ 397.873660] driver_detach+0x35/0x70
[ 397.873668] bus_remove_driver+0x53/0xd0
[ 397.873675] pci_unregister_driver+0x25/0xa0
[ 397.873683] __se_sys_delete_module+0x162/0x210
[ 397.873691] ? do_syscall_64+0xd/0x190
[ 397.873697] do_syscall_64+0x55/0x190
[ 397.873704] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 397.873710] RIP: 0033:0x7faf884231b7
[ 397.873714] Code: 73 01 c3 48 8b 0d d1 8c 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 8c 2c 00 f7 d8 64 89 01 48
[ 397.873775] RSP: 002b:00007ffda4e98cf8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
[ 397.873784] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faf884231b7
[ 397.873790] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055fbb18f1bd8
[ 397.873796] RBP: 000055fbb18f1b70 R08: 000055fbb18f1bdc R09: 00007ffda4e98d38
[ 397.873802] R10: 00007ffda4e97cf4 R11: 0000000000000206 R12: 000055fbb0d32470
[ 397.873808] R13: 00007ffda4e992e0 R14: 0000000000000000 R15: 0000000000000000
v2: It's use-after-free; not a NULL pointer.
Testcase: igt/drv_module_reload/basic-reload-inject
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180726085033.4044-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_guc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_guc.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c index 846d693ecb53..3082d7670f05 100644 --- a/drivers/gpu/drm/i915/intel_guc.c +++ b/drivers/gpu/drm/i915/intel_guc.c @@ -128,13 +128,15 @@ static int guc_init_wq(struct intel_guc *guc) static void guc_fini_wq(struct intel_guc *guc) { - struct drm_i915_private *dev_priv = guc_to_i915(guc); + struct workqueue_struct *wq; - if (HAS_LOGICAL_RING_PREEMPTION(dev_priv) && - USES_GUC_SUBMISSION(dev_priv)) - destroy_workqueue(guc->preempt_wq); + wq = fetch_and_zero(&guc->preempt_wq); + if (wq) + destroy_workqueue(wq); - destroy_workqueue(guc->log.relay.flush_wq); + wq = fetch_and_zero(&guc->log.relay.flush_wq); + if (wq) + destroy_workqueue(wq); } int intel_guc_init_misc(struct intel_guc *guc) |