1 files changed, 5 insertions, 0 deletions
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index d6e03dbc0e..1eacf9e831 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -416,6 +416,11 @@ static int add_to_iovec(QEMUFile *f, const uint8_t *buf, size_t size,
     {
         f->iov[f->iovcnt - 1].iov_len += size;
     } else {
+        if (f->iovcnt >= MAX_IOV_SIZE) {
+            /* Should only happen if a previous fflush failed */
+            assert(f->shutdown || !qemu_file_is_writable(f));
+            return 1;
+        }
         if (may_free) {
             set_bit(f->iovcnt, f->may_free);
         }