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mirror: Check for bdrv_get_info result

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

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2014-04-29 18:14:17 +08:00 committed by Kevin Wolf
parent 373df5b135
commit c3cc95bd15
1 changed files with 4 additions and 1 deletions
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block/mirror.c
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@ -339,7 +339,10 @@ static void coroutine_fn mirror_run(void *opaque)
bdrv_get_backing_filename(s->target, backing_filename, bdrv_get_backing_filename(s->target, backing_filename,
sizeof(backing_filename)); sizeof(backing_filename));
if (backing_filename[0] && !s->target->backing_hd) { if (backing_filename[0] && !s->target->backing_hd) {
bdrv_get_info(s->target, &bdi); ret = bdrv_get_info(s->target, &bdi);
if (ret < 0) {
goto immediate_exit;
}
if (s->granularity < bdi.cluster_size) { if (s->granularity < bdi.cluster_size) {
s->buf_size = MAX(s->buf_size, bdi.cluster_size); s->buf_size = MAX(s->buf_size, bdi.cluster_size);
s->cow_bitmap = bitmap_new(length); s->cow_bitmap = bitmap_new(length);