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

[Ma Ke]

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

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

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
index 9caba10315a8..6cf946adb6fe 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
@@ -458,6 +458,8 @@ static void amdgpu_connector_add_common_modes(struct 
drm_encoder *encoder,
                        continue;
 
                mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 
60, false, false, false);
+               if (!mode)
+                       continue;
                drm_mode_probed_add(connector, mode);
        }
 }
-- 
2.25.1