From: Natalia Petrova n.petrova@fintech.ru
[ Upstream commit 20a2ce87fbaf81e4c3dcb631d738e423959eb320 ]
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.petro... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/nouveau/nouveau_connector.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c index b5c8219c54557..4f604d71a46ea 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.c +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c @@ -945,7 +945,7 @@ 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 @@ -966,7 +966,7 @@ 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)