From: Srinivasan Shanmugam <srinivasan.shanmu...@amd.com>
[ Upstream commit 66d71a72539e173a9b00ca0b1852cbaa5f5bf1ad ]
This commit addresses a null pointer dereference issue in the
`commit_planes_for_stream` function at line 4140. The issue could occur
when `top_pipe_to_program` is null.
The fix adds a check to ensure `top_pipe_to_program` is not null before
accessing its stream_res. This prevents a null pointer dereference.
Reported by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:4140
commit_planes_for_stream() error: we previously assumed 'top_pipe_to_program'
could be null (see line 3906)
Cc: Tom Chung <chiahsuan.ch...@amd.com>
Cc: Rodrigo Siqueira <rodrigo.sique...@amd.com>
Cc: Roman Li <roman...@amd.com>
Cc: Alex Hung <alex.h...@amd.com>
Cc: Aurabindo Pillai <aurabindo.pil...@amd.com>
Cc: Harry Wentland <harry.wentl...@amd.com>
Cc: Hamza Mahfooz <hamza.mahf...@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmu...@amd.com>
Reviewed-by: Tom Chung <chiahsuan.ch...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c
b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 50e643bfdfbad..0b2eb2a6c8e14 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3797,7 +3797,8 @@ static void commit_planes_for_stream(struct dc *dc,
}
if ((update_type != UPDATE_TYPE_FAST) &&
stream->update_flags.bits.dsc_changed)
- if
(top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
+ if (top_pipe_to_program &&
+
top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
top_pipe_to_program->stream_res.tg->funcs->wait_for_state(
top_pipe_to_program->stream_res.tg,
CRTC_STATE_VACTIVE);
--
2.43.0
