From: Srinivasan Shanmugam <[email protected]>

commit 15c2990e0f0108b9c3752d7072a97d45d4283aea upstream.

This commit adds null checks for the 'stream' and 'plane' variables in
the dcn30_apply_idle_power_optimizations function. These variables were
previously assumed to be null at line 922, but they were used later in
the code without checking if they were null. This could potentially lead
to a null pointer dereference, which would cause a crash.

The null checks ensure that 'stream' and 'plane' are not null before
they are used, preventing potential crashes.

Fixes the below static smatch checker:
drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c:938 
dcn30_apply_idle_power_optimizations() error: we previously assumed 'stream' 
could be null (see line 922)
drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c:940 
dcn30_apply_idle_power_optimizations() error: we previously assumed 'plane' 
could be null (see line 922)

Cc: Tom Chung <[email protected]>
Cc: Nicholas Kazlauskas <[email protected]>
Cc: Bhawanpreet Lakha <[email protected]>
Cc: Rodrigo Siqueira <[email protected]>
Cc: Roman Li <[email protected]>
Cc: Hersen Wu <[email protected]>
Cc: Alex Hung <[email protected]>
Cc: Aurabindo Pillai <[email protected]>
Cc: Harry Wentland <[email protected]>
Signed-off-by: Srinivasan Shanmugam <[email protected]>
Reviewed-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Signed-off-by: Zhi Yang <[email protected]>
Signed-off-by: He Zhe <[email protected]>
---
Build test passed.
---
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c 
b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
index 81547178a934..30716b88136c 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -784,6 +784,9 @@ bool dcn30_apply_idle_power_optimizations(struct dc *dc, 
bool enable)
                        stream = dc->current_state->streams[0];
                        plane = (stream ? 
dc->current_state->stream_status[0].plane_states[0] : NULL);
 
+                       if (!stream || !plane)
+                               return false;
+
                        if (stream && plane) {
                                cursor_cache_enable = 
stream->cursor_position.enable &&
                                                
plane->address.grph.cursor_cache_addr.quad_part;
-- 
2.34.1

Reply via email to