diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2019-09-20 17:20:43 +0300 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2019-10-30 11:34:26 -0500 |
| commit | 783e7eb52c0a8e2b8cb906566d0dc2538ffefccf (patch) | |
| tree | a64949c115cd124e4f43c15e786387610b6ddc04 | |
| parent | e01ed1a1ae42e023fa8f91c9e3905f4f9c3523a0 (diff) | |
block/backup: fix backup_cow_with_offload for last cluster
We shouldn't try to copy bytes beyond EOF. Fix it.
Fixes: 9ded4a0114968e
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20190920142056.12778-3-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit 1048ddf0a32dcdaa952e581bd503d49adad527cc)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -rw-r--r-- | block/backup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/backup.c b/block/backup.c index 7067d1d1ad..8761f1f9a7 100644 --- a/block/backup.c +++ b/block/backup.c @@ -167,7 +167,7 @@ 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, job->len) - start); nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size); hbitmap_reset(job->copy_bitmap, start, job->cluster_size * nr_clusters); ret = blk_co_copy_range(blk, start, job->target, start, nbytes, |