From: Alex Hung alex.hung@amd.com
stable inclusion from stable-v6.6.55 commit 42d31a33643813cce55ee1ebbad3a2d0d24a08e0 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYR9N CVE: CVE-2024-49896
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 35ff747c86767937ee1e0ca987545b7eed7a0810 ]
[WHAT & HOW] amdgpu_dm can pass a null stream to dc_is_stream_unchanged. It is necessary to check for null before dereferencing them.
This fixes 1 FORWARD_NULL issue reported by Coverity.
Reviewed-by: Rodrigo Siqueira rodrigo.siqueira@amd.com Signed-off-by: Jerry Zuo jerry.zuo@amd.com Signed-off-by: Alex Hung alex.hung@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Gu Bowen gubowen5@huawei.com --- drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c index 4b34bc9d4e4b..99fcd39bb15e 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c @@ -2154,6 +2154,8 @@ static bool are_stream_backends_same( bool dc_is_stream_unchanged( struct dc_stream_state *old_stream, struct dc_stream_state *stream) { + if (!old_stream || !stream) + return false;
if (!are_stream_backends_same(old_stream, stream)) return false;