gbm_dri_surface_create() might create gbm_surface without modifiers.
therefore, gbm_dri_surface_destroy() needs to check modifiers is null or not
prior to free it.

Signed-off-by: Mun Gwan-gyeong <elong...@gmail.com>
---
 src/gbm/backends/dri/gbm_dri.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gbm/backends/dri/gbm_dri.c b/src/gbm/backends/dri/gbm_dri.c
index ecb360773c..078ee1afda 100644
--- a/src/gbm/backends/dri/gbm_dri.c
+++ b/src/gbm/backends/dri/gbm_dri.c
@@ -1362,7 +1362,8 @@ gbm_dri_surface_destroy(struct gbm_surface *_surf)
 {
    struct gbm_dri_surface *surf = gbm_dri_surface(_surf);
 
-   free(surf->base.modifiers);
+   if (surf->base.modifiers)
+      free(surf->base.modifiers);
    free(surf);
 }
 
-- 
2.13.3

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