[Qemu-devel] [PATCH 13/18] virtio-blk: Return UNSUPP for unknown request types

[Stefan Hajnoczi <stefanha@redhat.com>]

From: Alexey Zaytsev <alexey.zaytsev@gmail.com>

Currently, all unknown requests are treated as VIRTIO_BLK_T_IN

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/virtio-blk.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 538a0ae..132180c 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -398,10 +398,14 @@ static void virtio_blk_handle_request(VirtIOBlockReq *req,
         qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
                                  req->elem.out_num - 1);
         virtio_blk_handle_write(req, mrb);
-    } else {
+    } else if (type == VIRTIO_BLK_T_IN || type == VIRTIO_BLK_T_BARRIER) {
+        /* VIRTIO_BLK_T_IN is 0, so we can't just & it. */
         qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
                                  req->elem.in_num - 1);
         virtio_blk_handle_read(req);
+    } else {
+        virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
+        g_free(req);
     }
 }
 
-- 
1.8.0.2