drm/nouveau: add nv_encoder pointer check for NULL

[ 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@fintech.ru>
Reviewed-by: Lyude Paul <lyude@redhat.com>
[Fixed patch title]
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512103320.82234-1-n.petrova@fintech.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index fd98473..f403105 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -730,7 +730,8 @@ out:
 #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;
 }