netdev - [PATCH] hp100: fix an skb->len race

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Message-ID: <1308523413.3539.97.camel@edumazet-laptop>
Date:	Mon, 20 Jun 2011 00:43:33 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	richardcochran@...il.com, netdev <netdev@...r.kernel.org>
Subject: [PATCH] hp100: fix an skb->len race

As soon as skb is given to hardware and spinlock released, TX completion
can free skb under us. Therefore, we should update netdev stats before
spinlock release.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 drivers/net/hp100.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hp100.c b/drivers/net/hp100.c
index 8e10d2f..c3ecb11 100644
--- a/drivers/net/hp100.c
+++ b/drivers/net/hp100.c
@@ -1580,12 +1580,12 @@ static netdev_tx_t hp100_start_xmit_bm(struct sk_buff *skb,
 	hp100_outl(ringptr->pdl_paddr, TX_PDA_L);	/* Low Prio. Queue */
 
 	lp->txrcommit++;
-	spin_unlock_irqrestore(&lp->lock, flags);
 
-	/* Update statistics */
 	dev->stats.tx_packets++;
 	dev->stats.tx_bytes += skb->len;
 
+	spin_unlock_irqrestore(&lp->lock, flags);
+
 	return NETDEV_TX_OK;
 
 drop:


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