[PATCH] drm/edid: fix a possible null pointer dereference

[Ma Ke]

In drm_mode_std(), the return value of drm_gtf_mode(),
drm_gtf_mode() and drm_cvt_mode() is assigned to mode,
which will lead to a NULL pointer dereference on failure
of drm_gtf_mode(), drm_gtf_mode() and drm_cvt_mode().
Add a check to avoid null point dereference.

Signed-off-by: Ma Ke <make_ruc2...@163.com>
---
 drivers/gpu/drm/drm_edid.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 340da8257b51..e2c154c2b896 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3381,6 +3381,8 @@ static struct drm_display_mode *drm_mode_std(struct 
drm_connector *connector,
                                    false);
                break;
        }
+       if (!mode)
+               return NULL;
        return mode;
 }
 
-- 
2.37.2