On Tue, Feb 18, 2025 at 02:18:18PM +0800, Xiangyu Chen wrote:
From: Srinivasan Shanmugam srinivasan.shanmugam@amd.com
[ Upstream commit f22f4754aaa47d8c59f166ba3042182859e5dff7 ]
This commit addresses a potential null pointer dereference issue in the `dcn201_acquire_free_pipe_for_layer` function. The issue could occur when `head_pipe` is null.
The fix adds a check to ensure `head_pipe` is not null before asserting it. If `head_pipe` is null, the function returns NULL to prevent a potential null pointer dereference.
Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn201/dcn201_resource.c:1016 dcn201_acquire_free_pipe_for_layer() error: we previously assumed 'head_pipe' could be null (see line 1010)
Cc: Tom Chung chiahsuan.chung@amd.com Cc: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Cc: Roman Li roman.li@amd.com Cc: Alex Hung alex.hung@amd.com Cc: Aurabindo Pillai aurabindo.pillai@amd.com Cc: Harry Wentland harry.wentland@amd.com Cc: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Srinivasan Shanmugam srinivasan.shanmugam@amd.com Reviewed-by: Tom Chung chiahsuan.chung@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com [dcn201 was moved from drivers/gpu/drm/amd/display/dc to drivers/gpu/drm/amd/display/dc/resource since 8b8eed05a1c6 ("drm/amd/display: Refactor resource into component directory"). The path is changed accordingly to apply the patch on 6.6.y.] Signed-off-by: Xiangyu Chen xiangyu.chen@windriver.com Signed-off-by: He Zhe zhe.he@windriver.com
Verified the build test only due to we don't have DCN201 device.
If you don't have this, why do you need or want it backported to different stable kernels?
confused,
greg k-h