6.6-stable review patch. If anyone has any objections, please let me know.
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From: Srinivasan Shanmugam srinivasan.shanmugam@amd.com
[ Upstream commit cd9e9e0852d501f169aa3bb34e4b413d2eb48c37 ]
This commit adds a null check for the 'afb' variable in the amdgpu_dm_plane_handle_cursor_update function. Previously, 'afb' was assumed to be null, but was used later in the code without a null check. This could potentially lead to a null pointer dereference.
Changes since v1: - Moved the null check for 'afb' to the line where 'afb' is used. (Alex)
Fixes the below: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_plane.c:1298 amdgpu_dm_plane_handle_cursor_update() error: we previously assumed 'afb' could be null (see line 1252)
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 Co-developed-by: Alex Hung alex.hung@amd.com Signed-off-by: Alex Hung alex.hung@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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c index fa9f53b310793..d1329f20b7bd4 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c @@ -1281,7 +1281,8 @@ void amdgpu_dm_plane_handle_cursor_update(struct drm_plane *plane, adev->dm.dc->caps.color.dpp.gamma_corr) attributes.attribute_flags.bits.ENABLE_CURSOR_DEGAMMA = 1;
- attributes.pitch = afb->base.pitches[0] / afb->base.format->cpp[0]; + if (afb) + attributes.pitch = afb->base.pitches[0] / afb->base.format->cpp[0];
if (crtc_state->stream) { mutex_lock(&adev->dm.dc_lock);