linux-kernel - [PATCH 3.12 26/77] net: fec: fix potential use after free

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Message-Id: <20140114002753.245555212@linuxfoundation.org>
Date:	Mon, 13 Jan 2014 16:27:47 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Frank Li <Frank.Li@...escale.com>,
	Richard Cochran <richardcochran@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.12 26/77] net: fec: fix potential use after free

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 7a2a84518cfb263d2c4171b3d63671f88316adb2 ]

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.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Fixes: de5fb0a05348 ("net: fec: put tx to napi poll function to fix dead lock")
Cc: Frank Li <Frank.Li@...escale.com>
Cc: Richard Cochran <richardcochran@...il.com>
Acked-by: Richard Cochran <richardcochran@...il.com>
Acked-by: Frank Li <Frank.Li@...escale.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/freescale/fec_main.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -425,6 +425,8 @@ fec_enet_start_xmit(struct sk_buff *skb,
 	/* If this was the last BD in the ring, start at the beginning again. */
 	bdp = fec_enet_get_nextdesc(bdp, fep);
 
+	skb_tx_timestamp(skb);
+
 	fep->cur_tx = bdp;
 
 	if (fep->cur_tx == fep->dirty_tx)
@@ -433,8 +435,6 @@ fec_enet_start_xmit(struct sk_buff *skb,
 	/* Trigger transmission start */
 	writel(0, fep->hwp + FEC_X_DES_ACTIVE);
 
-	skb_tx_timestamp(skb);
-
 	return NETDEV_TX_OK;
 }
 


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