From: Charlene Liu <Charlene.Liu@amd.com>
Date: Thu, 6 Nov 2025 23:10:30 +0000 (-0500)
Subject: drm/amd/display: Add null pointer check in link_dpms
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8ffa289f90be1a9b5bf693aa61004a9411ffe93a;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: Add null pointer check in link_dpms

[why]
Check that the stream exists to add link->local_sink null pointer access
protection.

Reviewed-by: Harold Sun <harold.sun@amd.com>
Reviewed-by: Ethan Cheung <ethan.cheung@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan 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_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
index 4ddcdc222913d..2a70dcdd2e477 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
@@ -2226,7 +2226,11 @@ static enum dc_status enable_link(
 {
 	enum dc_status status = DC_ERROR_UNEXPECTED;
 	struct dc_stream_state *stream = pipe_ctx->stream;
-	struct dc_link *link = stream->link;
+	struct dc_link *link = NULL;
+
+	if (stream == NULL)
+		return DC_ERROR_UNEXPECTED;
+	link = stream->link;
 
 	/* There's some scenarios where driver is unloaded with display
 	 * still enabled. When driver is reloaded, it may cause a display