This is a note to let you know that I've just added the patch titled
drm/amdgpu: fix use-after-free during gpu recovery
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amdgpu-fix-use-after-free-during-gpu-recovery.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ece2880603406e6fbd2531ad6a823db6517e2d08
Author: Stanley.Yang <Stanley.Yang@xxxxxxx>
Date: Wed Nov 16 17:08:22 2022 +0800
drm/amdgpu: fix use-after-free during gpu recovery
[ Upstream commit 3cb93f390453cde4d6afda1587aaa00e75e09617 ]
[Why]
[ 754.862560] refcount_t: underflow; use-after-free.
[ 754.862898] Call Trace:
[ 754.862903] <TASK>
[ 754.862913] amdgpu_job_free_cb+0xc2/0xe1 [amdgpu]
[ 754.863543] drm_sched_main.cold+0x34/0x39 [amd_sched]
[How]
The fw_fence may be not init, check whether dma_fence_init
is performed before job free
Signed-off-by: Stanley.Yang <Stanley.Yang@xxxxxxx>
Reviewed-by: Tao Zhou <tao.zhou1@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 3b025aace283..eb4c0523e42d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -167,7 +167,11 @@ static void amdgpu_job_free_cb(struct drm_sched_job *s_job)
amdgpu_sync_free(&job->sync);
amdgpu_sync_free(&job->sched_sync);
- dma_fence_put(&job->hw_fence);
+ /* only put the hw fence if has embedded fence */
+ if (!job->hw_fence.ops)
+ kfree(job);
+ else
+ dma_fence_put(&job->hw_fence);
}
void amdgpu_job_free(struct amdgpu_job *job)
