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drm/amd/display: Add NULL check for 'afb' before dereferencing in amdgpu_dm_plane_handle_cursor_update 

[ Upstream commit 38e6f715b02b572f74677eb2f29d3b4bc6f1ddff ]

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.

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: Hersen Wu <hersenxs.wu@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Srinivasan Shanmugam 2024-06-05 21:13:40 +05:30 committed by Greg Kroah-Hartman
parent a29c1e51ef
commit a59941605a
1 changed files with 12 additions and 4 deletions
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16
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
View File

@ -1225,14 +1225,22 @@ void amdgpu_dm_plane_handle_cursor_update(struct drm_plane *plane,
{
struct amdgpu_device *adev = drm_to_adev(plane->dev);
struct amdgpu_framebuffer *afb = to_amdgpu_framebuffer(plane->state->fb);
struct drm_crtc *crtc = afb ? plane->state->crtc : old_plane_state->crtc;
struct dm_crtc_state *crtc_state = crtc ? to_dm_crtc_state(crtc->state) : NULL;
struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
uint64_t address = afb ? afb->address : 0;
struct drm_crtc *crtc;
struct dm_crtc_state *crtc_state;
struct amdgpu_crtc *amdgpu_crtc;
u64 address;
struct dc_cursor_position position = {0};
struct dc_cursor_attributes attributes;
int ret;
if (!afb)
return;
crtc = plane->state->crtc ? plane->state->crtc : old_plane_state->crtc;
crtc_state = crtc ? to_dm_crtc_state(crtc->state) : NULL;
amdgpu_crtc = to_amdgpu_crtc(crtc);
address = afb->address;
if (!plane->state->fb && !old_plane_state->fb)
return;