From 3c3de7c6b4cc78bf312e45402c60ce2a8e8a39ed Mon Sep 17 00:00:00 2001
From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Tue, 26 Mar 2013 17:32:44 +0100
Subject: virtio-ccw: Queue sanity check for notify hypercall.

Verify that the virtio-ccw notify hypercall passed a reasonable
value for queue.

Cc: qemu-stable@nongnu.org
Reported-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
(cherry picked from commit b57ed9bf075e33cdd2f9eb545ff555301dd57221)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/s390x/s390-virtio-ccw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 6549211820..f90b5e4476 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -31,6 +31,9 @@ static int virtio_ccw_hcall_notify(const uint64_t *args)
     if (!sch || !css_subch_visible(sch)) {
         return -EINVAL;
     }
+    if (queue >= VIRTIO_PCI_QUEUE_MAX) {
+        return -EINVAL;
+    }
     virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
     return 0;
 
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