[Mesa-stable] [PATCH] gbm: fix potential NULL deref of mapImage/unmapImage.

[Chuanbo Weng]

The mapImage/unmapImage functions of DRIimage extension can be NULL,
so we should add additional check for them.

Cc: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Chuanbo Weng <chuanbo.weng at intel.com>
---
 src/gbm/backends/dri/gbm_dri.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/gbm/backends/dri/gbm_dri.c b/src/gbm/backends/dri/gbm_dri.c
index c3626e3..b14faef 100644
--- a/src/gbm/backends/dri/gbm_dri.c
+++ b/src/gbm/backends/dri/gbm_dri.c
@@ -941,7 +941,7 @@ gbm_dri_bo_map(struct gbm_bo *_bo,
       return *map_data;
    }
 
-   if (!dri->image || dri->image->base.version < 12) {
+   if (!dri->image || dri->image->base.version < 12 || !dri->image->mapImage) {
       errno = ENOSYS;
       return NULL;
    }
@@ -972,7 +972,8 @@ gbm_dri_bo_unmap(struct gbm_bo *_bo, void *map_data)
       return;
    }
 
-   if (!dri->context || !dri->image || dri->image->base.version < 12)
+   if (!dri->context || !dri->image ||
+       dri->image->base.version < 12 || !dri->image->unmapImage)
       return;
 
    dri->image->unmapImage(dri->context, bo->image, map_data);
-- 
1.9.1