xen_disk: fix possible null-ptr dereference

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
index aed5b5b3e93f8c03a817ed7abf8204b03e096b37..a221d0bfca7fc18c2d0c215af9d627a6ac6247f4 100644 (file)
--- a/hw/block/xen_disk.c
+++ b/hw/block/xen_disk.c
@@ -589,6 +589,7 @@ static int blk_send_response_one(struct ioreq *ioreq)
         break;
     default:
         dst = NULL;
+        return 0;
     }
     memcpy(dst, &resp, sizeof(resp));
     blkdev->rings.common.rsp_prod_pvt++;