[Qemu-devel] [PULL 03/10] vhost-user-blk: prevent using uninitialized vqs

["Michael S. Tsirkin" <mst@redhat.com>]

From: Raphael Norwitz <raphael.norwitz@nutanix.com>

Same rational as: e6cc11d64fc998c11a4dfcde8fda3fc33a74d844

Of the 3 virtqueues, seabios only sets cmd, leaving ctrl
and event without a physical address. This can cause
vhost_verify_ring_part_mapping to return ENOMEM, causing
the following logs:

qemu-system-x86_64: Unable to map available ring for ring 0
qemu-system-x86_64: Verify ring failure on region 0

This has already been fixed for vhost scsi devices and was
recently vhost-user scsi devices. This commit fixes it for
vhost-user-blk devices.

Suggested-by: Phillippe Mathieu-Daude <philmd@redhat.com>
Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Message-Id: <1566498865-55506-1-git-send-email-raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/block/vhost-user-blk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 0b8c5dfeab..63da9bb619 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -421,7 +421,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
     }
 
     s->inflight = g_new0(struct vhost_inflight, 1);
-    s->vqs = g_new(struct vhost_virtqueue, s->num_queues);
+    s->vqs = g_new0(struct vhost_virtqueue, s->num_queues);
     s->watch = 0;
     s->connected = false;
 
-- 
MST