[PATCH 5.4 54/64] drm/nouveau: add nv_encoder pointer check for NULL

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From: Natalia Petrova <n.petrova@xxxxxxxxxx>

[ Upstream commit 55b94bb8c42464bad3d2217f6874aa1a85664eac ]

Pointer nv_encoder could be dereferenced at nouveau_connector.c
in case it's equal to NULL by jumping to goto label.
This patch adds a NULL-check to avoid it.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 3195c5f9784a ("drm/nouveau: set encoder for lvds")
Signed-off-by: Natalia Petrova <n.petrova@xxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
[Fixed patch title]
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512103320.82234-1-n.petrova@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/nouveau/nouveau_connector.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 048a04701910e..85a20fe2709af 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -730,7 +730,8 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 #endif
 
 	nouveau_connector_set_edid(nv_connector, edid);
-	nouveau_connector_set_encoder(connector, nv_encoder);
+	if (nv_encoder)
+		nouveau_connector_set_encoder(connector, nv_encoder);
 	return status;
 }
 
-- 
2.39.2






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