drm/radeon: check for allocation failure in radeon_ring_backup()

Static checkers complain if this we don't check for allocation failure.
Also we can use the new kmalloc_array() function here as a cleanup.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index f2fc25de0b2f..ec79b3750430 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -594,7 +594,11 @@ unsigned radeon_ring_backup(struct radeon_device *rdev, struct radeon_ring *ring
         }
 
         /* and then save the content of the ring */
-        *data = kmalloc(size * 4, GFP_KERNEL);
+        *data = kmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
+        if (!*data) {
+                mutex_unlock(&rdev->ring_lock);
+                return 0;
+        }
         for (i = 0; i < size; ++i) {
                 (*data)[i] = ring->ring[ptr++];
                 ptr &= ring->ptr_mask;