diff options
| author | Jason Wang <jasowang@redhat.com> | 2018-08-08 11:43:04 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-22 07:46:09 +0200 |
| commit | 59f9f2c76fe16026f293d87ae6001f80ccab420b (patch) | |
| tree | 2b79dea4f4f562581f0127c29f61a87c374e7d5b /drivers/vhost/vhost.c | |
| parent | e125b1cc673adc14290a9c820ab2a27b3a7f75ec (diff) | |
vhost: reset metadata cache when initializing new IOTLB
[ Upstream commit b13f9c6364373a1b9f71e9846dc4fb199296f926 ]
We need to reset metadata cache during new IOTLB initialization,
otherwise the stale pointers to previous IOTLB may be still accessed
which will lead a use after free.
Reported-by: syzbot+c51e6736a1bf614b3272@syzkaller.appspotmail.com
Fixes: f88949138058 ("vhost: introduce O(1) vq metadata cache")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/vhost/vhost.c')
| -rw-r--r-- | drivers/vhost/vhost.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 244e5256c526..3cf74f54c7a1 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1578,9 +1578,12 @@ int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled) d->iotlb = niotlb; for (i = 0; i < d->nvqs; ++i) { - mutex_lock(&d->vqs[i]->mutex); - d->vqs[i]->iotlb = niotlb; - mutex_unlock(&d->vqs[i]->mutex); + struct vhost_virtqueue *vq = d->vqs[i]; + + mutex_lock(&vq->mutex); + vq->iotlb = niotlb; + __vhost_vq_meta_reset(vq); + mutex_unlock(&vq->mutex); } vhost_umem_clean(oiotlb); |