diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2-refcount.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index a84620ffe..da7d3f240 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -284,8 +284,12 @@ static int update_refcount(BlockDriverState *bs, printf("update_refcount: offset=%" PRId64 " size=%" PRId64 " addend=%d\n", offset, length, addend); #endif - if (length <= 0) + if (length < 0) { return -EINVAL; + } else if (length == 0) { + return 0; + } + start = offset & ~(s->cluster_size - 1); last = (offset + length - 1) & ~(s->cluster_size - 1); for(cluster_offset = start; cluster_offset <= last; |