From: Vladimir Sementsov-Ogievskiy <[email protected]> We shouldn't try to copy bytes beyond EOF. Fix it.
Fixes: 9ded4a0114968e Signed-off-by: Vladimir Sementsov-Ogievskiy <[email protected]> Reviewed-by: Max Reitz <[email protected]> Reviewed-by: John Snow <[email protected]> Message-id: [email protected] Signed-off-by: Max Reitz <[email protected]> (cherry picked from commit 1048ddf0a32dcdaa952e581bd503d49adad527cc) Signed-off-by: Michael Roth <[email protected]> --- block/backup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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, -- 2.17.1
