From: Richard Chiang <Richard.Chiang@amd.com>
Date: Wed, 3 Dec 2025 14:24:59 +0000 (+0800)
Subject: drm/amd/display: sink EDID data null check
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a8936060a01715552cac818019ca5e88201a3b7b;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: sink EDID data null check

[Why]
When sink EDID data pointer is NULL, it will cause an
unexpected error.

[How]
Check data pointer is not NULL first.

Reviewed-by: Yihan Zhu <yihan.zhu@amd.com>
Signed-off-by: Richard Chiang <Richard.Chiang@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
index 373e68cf2bde..080642dfde2a 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
@@ -623,6 +623,9 @@ static bool detect_dp(struct dc_link *link,
 
 static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid)
 {
+	if (old_edid == NULL || new_edid == NULL)
+		return false;
+
 	if (old_edid->length != new_edid->length)
 		return false;