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vhost: Fix host panic if ioctl called with wrong index 

Missed a boundary value check in vhost_set_vring. The host panics if
idx == nvqs is used in ioctl commands in vhost_virtqueue_init.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Krishna Kumar 2010-05-25 11:10:36 +05:30 committed by Michael S. Tsirkin
parent 8a74ad60a5
commit 0f3d9a1746
1 changed files with 1 additions and 1 deletions
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2
drivers/vhost/vhost.c
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@ -374,7 +374,7 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
r = get_user(idx, idxp);
if (r < 0)
return r;
if (idx > d->nvqs)
if (idx >= d->nvqs)
return -ENOBUFS;
vq = d->vqs + idx;