netdev - Re: [PATCH] SMC911X: Fix using of dereferenced skb after netif

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Date:	Mon, 03 Dec 2007 18:18:27 +0800
From:	Wang Chen <wangchen@...fujitsu.com>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	Herbert Xu <herbert@...dor.apana.org.au>,
	Dustin McIntire <dustin@...soria.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH] SMC911X: Fix using of dereferenced skb after netif_rx

Herbert Xu said the following on 2007-12-3 18:11:
> Please send driver patches to Jeff Garzik <jgarzik@...ox.com>.
> 

Sorry. Resend the patch.

After netif_rx(), skb will be freed. So get the
skb->len before netif_rx().

Signed-off-by: Wang Chen <wangchen@...fujitsu.com>
---
 smc911x.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

--- linux-2.6.24.rc3.org/drivers/net/smc911x.c	2007-11-19 12:38:05.000000000 +0800
+++ linux-2.6.24.rc3/drivers/net/smc911x.c	2007-11-30 15:00:53.000000000 +0800
@@ -1287,7 +1287,7 @@ smc911x_rx_dma_irq(int dma, void *data)
 	struct smc911x_local *lp = netdev_priv(dev);
 	struct sk_buff *skb = lp->current_rx_skb;
 	unsigned long flags;
-	unsigned int pkts;
+	unsigned int pkts, len;
 
 	DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __FUNCTION__);
 	DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA, "%s: RX DMA irq handler\n", dev->name);
@@ -1299,9 +1299,10 @@ smc911x_rx_dma_irq(int dma, void *data)
 	PRINT_PKT(skb->data, skb->len);
 	dev->last_rx = jiffies;
 	skb->protocol = eth_type_trans(skb, dev);
+	len = skb->len;
 	netif_rx(skb);
 	dev->stats.rx_packets++;
-	dev->stats.rx_bytes += skb->len;
+	dev->stats.rx_bytes += len;
 
 	spin_lock_irqsave(&lp->lock, flags);
 	pkts = (SMC_GET_RX_FIFO_INF() & RX_FIFO_INF_RXSUSED_) >> 16;

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