tree dccd59dd04aef986186afb3bb4ff279bebe245b7
parent 58f101bf87e32753342a6924772c6ebb0fbde24a
author Jason Wang <jasowang@redhat.com> 1522310404 +0800
committer David S. Miller <davem@davemloft.net> 1522354967 -0400

vhost: validate log when IOTLB is enabled

Vq log_base is the userspace address of bitmap which has nothing to do
with IOTLB. So it needs to be validated unconditionally otherwise we
may try use 0 as log_base which may lead to pin pages that will lead
unexpected result (e.g trigger BUG_ON() in set_bit_to_user()).

Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API")
Reported-by: syzbot+6304bf97ef436580fede@syzkaller.appspotmail.com
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>