Commit ac4d5492 authored Oct 09, 2024 by winstang Committed by Yu Liao Oct 09, 2024

drm/amd/display: added NULL check at start of dc_validate_stream

stable inclusion
from stable-v6.6.50
commit 154a50bf4221a6a6ccf88d565b8184da7c40a2dd
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAU9N4
CVE: CVE-2024-46802

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=154a50bf4221a6a6ccf88d565b8184da7c40a2dd



--------------------------------

[ Upstream commit 26c56049cc4f1705b498df013949427692a4b0d5 ]

[Why]
prevent invalid memory access

[How]
check if dc and stream are NULL

Co-authored-by: winstang <winstang@amd.com>
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: winstang <winstang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>

parent 59253ba0

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -3927,6 +3927,9 @@ void resource_build_bit_depth_reduction_params(struct dc_stream_state *stream,

		enum dc_status dc_validate_stream(struct dc dc, struct dc_stream_state stream)
		{
		if (dc == NULL \|\| stream == NULL)
		return DC_ERROR_UNEXPECTED;

		struct dc_link *link = stream->link;
		struct timing_generator *tg = dc->res_pool->timing_generators[0];
		enum dc_status res = DC_OK;