[Qemu-devel] [PATCH 5/5] mirror: Check for bdrv_get_info result

[Fam Zheng]

bdrv_get_info could fail. Add check before using the returned value.

Signed-off-by: Fam Zheng <address@hidden>
---
 block/mirror.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 7b95acf..c0c321b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -320,8 +320,8 @@ 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);
         }
-- 
1.8.4.2