[PATCH] vhost: Fix host panic if ioctl called with wrong index

Krishna Kumar
2010-05-25T05:40:36Z

From: Krishna Kumar <krkumar2@in.ibm.com>

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>
---
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;