[Qemu-block] [PATCH v9 01/13] block/backup: fix backup_cow_with_offload for last cluster

[Vladimir Sementsov-Ogievskiy]

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 2baf7bed65..33b144305f 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -161,7 +161,7 @@ static int coroutine_fn 
backup_cow_with_offload(BackupBlockJob *job,
 
     assert(QEMU_IS_ALIGNED(job->copy_range_size, job->cluster_size));
     assert(QEMU_IS_ALIGNED(start, job->cluster_size));
-    nbytes = MIN(job->copy_range_size, end - start);
+    nbytes = MIN(job->copy_range_size, MIN(end - start, job->len - start));
     nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size);
     bdrv_reset_dirty_bitmap(job->copy_bitmap, start,
                             job->cluster_size * nr_clusters);
-- 
2.18.0