We shouldn't try to copy bytes beyond EOF. Fix it.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
---
block/backup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/backup.c b/block/backup.c
index a4d37d2d62..eb41e4af4f 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -155,7 +155,7 @@ static int coroutine_fn
backup_cow_with_offload(BackupBlockJob *job,
int ret;
int nr_clusters;
BlockBackend *blk = job->common.blk;
- int nbytes = end - start;
+ int nbytes = MIN(end - start, job->len - start);
int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0;
assert(end - start < INT_MAX);
--
2.18.0
