This is a note to let you know that I've just added the patch titled
drm/nouveau/dp: check for NULL nv_connector->native_mode
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-nouveau-dp-check-for-null-nv_connector-native_mo.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 66d072988dda49d605458809f5849e8e80bdebbb
Author: Natalia Petrova <n.petrova@xxxxxxxxxx>
Date: Fri May 12 14:15:26 2023 +0300
drm/nouveau/dp: check for NULL nv_connector->native_mode
[ 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@xxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512111526.82408-1-n.petrova@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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)
