4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ma Ke <make24@xxxxxxxxxxx>
commit cb520c3f366c77e8d69e4e2e2781a8ce48d98e79 upstream.
In cdv_intel_lvds_get_modes(), the return value of drm_mode_duplicate()
is assigned to mode, which will lead to a NULL pointer dereference on
failure of drm_mode_duplicate(). Add a check to avoid npd.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6a227d5fd6c4 ("gma500: Add support for Cedarview")
Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240709113311.37168-1-make24@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/gma500/cdv_intel_lvds.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/gma500/cdv_intel_lvds.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c
@@ -404,6 +404,9 @@ static int cdv_intel_lvds_get_modes(stru
if (mode_dev->panel_fixed_mode != NULL) {
struct drm_display_mode *mode =
drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
+ if (!mode)
+ return 0;
+
drm_mode_probed_add(connector, mode);
return 1;
}
