1 files changed, 4 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 056525c7fd..470734be9f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1986,6 +1986,10 @@ static int qcow2_change_backing_file(BlockDriverState *bs,
 {
     BDRVQcow2State *s = bs->opaque;
 
+    if (backing_file && strlen(backing_file) > 1023) {
+        return -EINVAL;
+    }
+
     pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
     pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");