From 79c5f51c639021f7472591239c3867cee4b9ec02 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 18 Aug 2010 00:24:43 +0000
Subject: [PATCH] irda: fix a race in irlan_eth_xmit()
After skb is queued, its illegal to dereference it.
Cache skb->len into a temporary variable.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/irda/irlan/irlan_eth.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/irda/irlan/irlan_eth.c b/net/irda/irlan/irlan_eth.c
index 9616c32d1076..5bb8353105cc 100644
--- a/net/irda/irlan/irlan_eth.c
+++ b/net/irda/irlan/irlan_eth.c
@@ -169,6 +169,7 @@ static netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
{
struct irlan_cb *self = netdev_priv(dev);
int ret;
+ unsigned int len;
/* skb headroom large enough to contain all IrDA-headers? */
if ((skb_headroom(skb) < self->max_header_size) || (skb_shared(skb))) {
@@ -188,6 +189,7 @@ static netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
dev->trans_start = jiffies;
+ len = skb->len;
/* Now queue the packet in the transport layer */
if (self->use_udata)
ret = irttp_udata_request(self->tsap_data, skb);
@@ -209,7 +211,7 @@ static netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
self->stats.tx_dropped++;
} else {
self->stats.tx_packets++;
- self->stats.tx_bytes += skb->len;
+ self->stats.tx_bytes += len;
}
return NETDEV_TX_OK;
--
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