bdrv_get_info could fail. Add check before using the returned value.
Signed-off-by: Fam Zheng <[email protected]>
---
block/mirror.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/block/mirror.c b/block/mirror.c
index 0ef41f9..fafcc93 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -339,8 +339,8 @@ static void coroutine_fn mirror_run(void *opaque)
bdrv_get_backing_filename(s->target, backing_filename,
sizeof(backing_filename));
if (backing_filename[0] && !s->target->backing_hd) {
- bdrv_get_info(s->target, &bdi);
- if (s->granularity < bdi.cluster_size) {
+ ret = bdrv_get_info(s->target, &bdi);
+ if (ret == 0 && s->granularity < bdi.cluster_size) {
s->buf_size = MAX(s->buf_size, bdi.cluster_size);
s->cow_bitmap = bitmap_new(length);
}
--
1.9.2
