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-rw-r--r--block/qcow2.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index dbaf016bc7..7e614d76a4 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -869,7 +869,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
if (header.backing_file_offset != 0) {
len = header.backing_file_size;
if (len > MIN(1023, s->cluster_size - header.backing_file_offset) ||
- len > sizeof(bs->backing_file)) {
+ len >= sizeof(bs->backing_file)) {
error_setg(errp, "Backing file name too long");
ret = -EINVAL;
goto fail;