From 37ec274e9713eafc2ba6c4471420f06cb8f68ecf Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 19 Dec 2013 18:10:40 -0800
Subject: arc_emac: fix potential use after free
Signed-off-by: Eric Dumazet <edumazet@google.com>
skb_tx_timestamp(skb) should be called _before_ TX completion
has a chance to trigger, otherwise it is too late and we access
freed memory.
Fixes: e4f2379db6c6 ("ethernet/arc/arc_emac - Add new driver")
From: Eric Dumazet <edumazet@google.com>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/arc/emac_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'drivers/net/ethernet/arc/emac_main.c')
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index b2ffad1304d2..248baf6273fb 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -565,6 +565,8 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
/* Make sure pointer to data buffer is set */
wmb();
+ skb_tx_timestamp(skb);
+
*info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
/* Increment index to point to the next BD */
@@ -579,8 +581,6 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
arc_reg_set(priv, R_STATUS, TXPL_MASK);
- skb_tx_timestamp(skb);
-
return NETDEV_TX_OK;
}
--
cgit