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| author | Pan Bian <bianpan2016@163.com> | 2019-11-06 12:14:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-31 14:37:30 +0300 |
| commit | e54d9ee1b1ac31fcb420c1943abc3e481ce8b6aa (patch) | |
| tree | 2130586d3cdd2aed8c6632be0711ee5147c34623 | |
| parent | d622edacac43d1744d8b073daff78651028c268a (diff) | |
| download | linux-e54d9ee1b1ac31fcb420c1943abc3e481ce8b6aa.tar.xz | |
drm/amdgpu: fix potential double drop fence reference
[ Upstream commit 946ab8db6953535a3a88c957db8328beacdfed9d ]
The object fence is not set to NULL after its reference is dropped. As a
result, its reference may be dropped again if error occurs after that,
which may lead to a use after free bug. To avoid the issue, fence is
explicitly set to NULL after dropping its reference.
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_test.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c index ed8c3739015b..b35b0741fd97 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c @@ -125,6 +125,7 @@ static void amdgpu_do_test_moves(struct amdgpu_device *adev) } dma_fence_put(fence); + fence = NULL; r = amdgpu_bo_kmap(vram_obj, &vram_map); if (r) { @@ -170,6 +171,7 @@ static void amdgpu_do_test_moves(struct amdgpu_device *adev) } dma_fence_put(fence); + fence = NULL; r = amdgpu_bo_kmap(gtt_obj[i], >t_map); if (r) { |