From mboxrd@z Thu Jan 1 00:00:00 1970 From: Krishna Kumar Subject: [PATCH] vhost: Fix host panic if ioctl called with wrong index Date: Tue, 25 May 2010 11:10:36 +0530 Message-ID: <20100525054036.2022.66692.sendpatchset@krkumar2.in.ibm.com> Cc: netdev@vger.kernel.org, kvm@vger.kernel.org, Krishna Kumar To: mst@redhat.com Return-path: Sender: netdev-owner@vger.kernel.org List-Id: kvm.vger.kernel.org From: Krishna Kumar 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 --- drivers/vhost/vhost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -ruNp org/drivers/vhost/vhost.c new/drivers/vhost/vhost.c --- org/drivers/vhost/vhost.c 2010-05-24 09:25:57.000000000 +0530 +++ new/drivers/vhost/vhost.c 2010-05-24 09:26:53.000000000 +0530 @@ -374,7 +374,7 @@ static long vhost_set_vring(struct vhost r = get_user(idx, idxp); if (r < 0) return r; - if (idx > d->nvqs) + if (idx >= d->nvqs) return -ENOBUFS; vq = d->vqs + idx;