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vhost_net: zerocopy: fix possible NULL pointer dereference of vq->bufs 

When we want to disable vhost_net backend while there's a tx work, a possible
NULL pointer defernece may happen we we try to deference the vq->bufs after
vhost_net_set_backend() assign a NULL to it.

As suggested by Michael, fix this by checking the vq->bufs instead of
vhost_sock_zcopy().

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2012-05-02 11:42:23 +08:00 committed by Michael S. Tsirkin
parent b92946e291
commit c460f05739
1 changed files with 1 additions and 1 deletions
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2
drivers/vhost/net.c
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@ -166,7 +166,7 @@ static void handle_tx(struct vhost_net *net)
if (wmem < sock->sk->sk_sndbuf / 2)
tx_poll_stop(net);
hdr_size = vq->vhost_hlen;
zcopy = vhost_sock_zcopy(sock);
zcopy = vq->ubufs;
for (;;) {
/* Release DMAs done buffers first */