[PATCH] drm/gma500: fix null pointer dereference in psb_intel_lvds_get_modes

[Ma Ke]

In psb_intel_lvds_get_modes(), the return value of drm_mode_duplicate() is
assigned to mode, which will lead to a possible NULL pointer dereference
on failure of drm_mode_duplicate(). Add a check to avoid npd.

Signed-off-by: Ma Ke <mak...@iscas.ac.cn>
---
 drivers/gpu/drm/gma500/psb_intel_lvds.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/gma500/psb_intel_lvds.c 
b/drivers/gpu/drm/gma500/psb_intel_lvds.c
index 8486de230ec9..aa5bf2a8a319 100644
--- a/drivers/gpu/drm/gma500/psb_intel_lvds.c
+++ b/drivers/gpu/drm/gma500/psb_intel_lvds.c
@@ -504,6 +504,8 @@ static int psb_intel_lvds_get_modes(struct drm_connector 
*connector)
        if (mode_dev->panel_fixed_mode != NULL) {
                struct drm_display_mode *mode =
                    drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
+               if (!mode)
+                       return -ENOMEM;
                drm_mode_probed_add(connector, mode);
                return 1;
        }
-- 
2.25.1