[PATCH AUTOSEL 3.18 16/26] rapidio/rionet: do not free skb before reading its length

Sasha Levin
2018-12-05T09:56:24Z

From: Pan Bian <bianpan2016@163.com>

[ 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: Sasha Levin <sashal@kernel.org>
---
drivers/net/rionet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index 18cc2c8d5447..45b939b1506d 100644
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -215,9 +215,9 @@ 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);
}
}

--
2.17.1