If bdrv_unref() is passed a NULL BDS pointer, it is safe to
exit with no operation. This will allow cleanup code to blindly
call bdrv_unref() on a BDS that has been initialized to NULL.
Reviewed-by: Max Reitz <mre...@redhat.com>
Signed-off-by: Jeff Cody <jc...@redhat.com>
---
block.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block.c b/block.c
index 23f366d..f79efc8 100644
--- a/block.c
+++ b/block.c
@@ -5385,6 +5385,9 @@ void bdrv_ref(BlockDriverState *bs)
* deleted. */
void bdrv_unref(BlockDriverState *bs)
{
+ if (!bs) {
+ return;
+ }
assert(bs->refcnt > 0);
if (--bs->refcnt == 0) {
bdrv_delete(bs);
--
1.9.3
