5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ma Ke <make24@xxxxxxxxxxx>
commit 113fd6372a5bb3689aba8ef5b8a265ed1529a78f upstream.
In drm_client_modeset_probe(), the return value of drm_mode_duplicate() is
assigned to modeset->mode, which will lead to a possible NULL pointer
dereference on failure of drm_mode_duplicate(). Add a check to avoid npd.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: cf13909aee05 ("drm/fb-helper: Move out modeset config code")
Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240802044736.1570345-1-make24@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_client_modeset.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -792,6 +792,11 @@ int drm_client_modeset_probe(struct drm_
kfree(modeset->mode);
modeset->mode = drm_mode_duplicate(dev, mode);
+ if (!modeset->mode) {
+ ret = -ENOMEM;
+ break;
+ }
+
drm_connector_get(connector);
modeset->connectors[modeset->num_connectors++] = connector;
modeset->x = offset->x;
