drm/nouveau/dp: check for NULL nv_connector->native_mode

Add checking for NULL before calling nouveau_connector_detect_depth() in
nouveau_connector_get_modes() function because nv_connector->native_mode
could be dereferenced there since connector pointer passed to
nouveau_connector_detect_depth() and the same value of
nv_connector->native_mode is used there.

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

Fixes: d4c2c99bdc83 ("drm/nouveau/dp: remove broken display depth function, use the improved one")

Signed-off-by: Natalia Petrova <n.petrova@fintech.ru>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512111526.82408-1-n.petrova@fintech.ru

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 086b66b..5dbf025 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -966,7 +966,7 @@ nouveau_connector_get_modes(struct drm_connector *connector)
        /* Determine display colour depth for everything except LVDS now,
         * DP requires this before mode_valid() is called.
         */
-       if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS)
+       if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS && nv_connector->native_mode)
                nouveau_connector_detect_depth(connector);
 
        /* Find the native mode if this is a digital panel, if we didn't
@@ -987,7 +987,7 @@ nouveau_connector_get_modes(struct drm_connector *connector)
         * "native" mode as some VBIOS tables require us to use the
         * pixel clock as part of the lookup...
         */
-       if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
+       if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS && nv_connector->native_mode)
                nouveau_connector_detect_depth(connector);
 
        if (nv_encoder->dcb->type == DCB_OUTPUT_TV)