drm/ttm: Read buffer overflow

Check whether index is within bounds before grabbing the element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index aa82d5370c38..c2b0d710d10f 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1182,13 +1182,14 @@ static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
 
 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 {
-        struct ttm_mem_type_manager *man = &bdev->man[mem_type];
+        struct ttm_mem_type_manager *man;
         int ret = -EINVAL;
 
         if (mem_type >= TTM_NUM_MEM_TYPES) {
                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
                 return ret;
         }
+        man = &bdev->man[mem_type];
 
         if (!man->has_type) {
                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "