From: Eric Dumazet Date: Wed, 18 Aug 2010 00:24:43 +0000 (+0000) Subject: irda: fix a race in irlan_eth_xmit() X-Git-Url: https://rtime.felk.cvut.cz/gitweb/lisovros/linux_canprio.git/commitdiff_plain/79c5f51c639021f7472591239c3867cee4b9ec02 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 Signed-off-by: David S. Miller --- diff --git a/net/irda/irlan/irlan_eth.c b/net/irda/irlan/irlan_eth.c index 9616c32d107..5bb8353105c 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;