| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 29/74] virtio_net: Fix out of bounds access of sq | Date | Mon, 4 Feb 2019 11:36:42 +0100 |
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4.19-stable review patch. If anyone has any objections, please let me know.
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From: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
[ Upstream commit 1667c08a9d31c7cdf09f4890816bfbf20b685495 ]
When XDP is disabled, curr_queue_pairs + smp_processor_id() can be larger than max_queue_pairs. There is no guarantee that we have enough XDP send queues dedicated for each cpu when XDP is disabled, so do not count drops on sq in that case.
Fixes: 5b8f3c8d30a6 ("virtio_net: Add XDP related stats") Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Acked-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/virtio_net.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-)
--- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -490,20 +490,17 @@ static int virtnet_xdp_xmit(struct net_d int ret, err; int i; - sq = virtnet_xdp_sq(vi); - - if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { - ret = -EINVAL; - drops = n; - goto out; - } - /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this * indicate XDP resources have been successfully allocated. */ xdp_prog = rcu_dereference(rq->xdp_prog); - if (!xdp_prog) { - ret = -ENXIO; + if (!xdp_prog) + return -ENXIO; + + sq = virtnet_xdp_sq(vi); + + if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { + ret = -EINVAL; drops = n; goto out; }
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