drm/amd/display: Fix null check for pipe_ctx->plane_state in dcn20_program_pipe

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[ Upstream commit 6a057072dd ]

This commit addresses a null pointer dereference issue in
dcn20_program_pipe(). Previously, commit 8e4ed3cf16 ("drm/amd/display:
Add null check for pipe_ctx->plane_state in dcn20_program_pipe")
partially fixed the null pointer dereference issue. However, in
dcn20_update_dchubp_dpp(), the variable pipe_ctx is passed in, and
plane_state is accessed again through pipe_ctx. Multiple if statements
directly call attributes of plane_state, leading to potential null
pointer dereference issues. This patch adds necessary null checks to
ensure stability.

Fixes: 8e4ed3cf16 ("drm/amd/display: Add null check for pipe_ctx->plane_state in dcn20_program_pipe")
Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Zicheng Qu 2024-11-05 14:01:36 +00:00 • committed by Greg Kroah-Hartman

parent ea371ce029

commit 3609259326

1 changed files with 3 additions and 3 deletions

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drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c

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