rapidio/rionet: do not free skb before reading its length

[ Upstream commit cfc435198f53a6fa1f656d98466b24967ff457d0 ]

skb is freed via dev_kfree_skb_any, however, skb->len is read then. This
may result in a use-after-free bug.

Fixes: e6161d64263 ("rapidio/rionet: rework driver initialization and removal")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index e9f101c..bfbb39f 100644 (file)
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -216,9 +216,9 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
                         * it just report sending a packet to the target
                         * (without actual packet transfer).
                         */
-                       dev_kfree_skb_any(skb);
                        ndev->stats.tx_packets++;
                        ndev->stats.tx_bytes += skb->len;
+                       dev_kfree_skb_any(skb);
                }
        }