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vhost_net: fix OoB on sendmsg() failure. 

commit 3c4cea8fa7f71f00c5279547043a84bc2a4d8b8c upstream.

If the sendmsg() call in vhost_tx_batch() fails, both the 'batched_xdp'
and 'done_idx' indexes are left unchanged. If such failure happens
when batched_xdp == VHOST_NET_BATCH, the next call to
vhost_net_build_xdp() will access and write memory outside the xdp
buffers area.

Since sendmsg() can only error with EBADFD, this change addresses the
issue explicitly freeing the XDP buffers batch on error.

Fixes: 0a0be13b8f ("vhost_net: batch submitting XDP buffers to underlayer sockets")
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni 2021-09-08 13:42:09 +02:00 committed by Greg Kroah-Hartman
parent 172749c879
commit e7332a1ac1
1 changed files with 10 additions and 1 deletions
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11
drivers/vhost/net.c
View File

@ -466,7 +466,7 @@ static void vhost_tx_batch(struct vhost_net *net,
.num = nvq->batched_xdp,
.ptr = nvq->xdp,
};
int err;
int i, err;
if (nvq->batched_xdp == 0)
goto signal_used;
@ -475,6 +475,15 @@ static void vhost_tx_batch(struct vhost_net *net,
err = sock->ops->sendmsg(sock, msghdr, 0);
if (unlikely(err < 0)) {
vq_err(&nvq->vq, "Fail to batch sending packets\n");
/* free pages owned by XDP; since this is an unlikely error path,
* keep it simple and avoid more complex bulk update for the
* used pages
*/
for (i = 0; i < nvq->batched_xdp; ++i)
put_page(virt_to_head_page(nvq->xdp[i].data));
nvq->batched_xdp = 0;
nvq->done_idx = 0;
return;
}