From 12b33dacb4bb3780512d3c6a4d064d9ed1172c0e Mon Sep 17 00:00:00 2001 From: Arend van Spriel Date: Wed, 2 Jan 2013 15:22:46 +0100 Subject: [PATCH] brcmfmac: cleanup netdev transmit callback The header of the ethernet packet is processed conditionally, but the check is wrong as it checks skb length is at least ETH_ALEN. It should check it is at least sizeof struct ethhdr instead. Reviewed-by: Pieter-Paul Giesberts Reviewed-by: Hante Meuleman Signed-off-by: Arend van Spriel Signed-off-by: John W. Linville --- .../net/wireless/brcm80211/brcmfmac/dhd_linux.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c index a1ca691..9ca7411 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c @@ -165,6 +165,7 @@ static int brcmf_netdev_start_xmit(struct sk_buff *skb, struct net_device *ndev) int ret; struct brcmf_if *ifp = netdev_priv(ndev); struct brcmf_pub *drvr = ifp->drvr; + struct ethhdr *eh; brcmf_dbg(TRACE, "Enter\n"); @@ -202,17 +203,20 @@ static int brcmf_netdev_start_xmit(struct sk_buff *skb, struct net_device *ndev) } } - /* Update multicast statistic */ - if (skb->len >= ETH_ALEN) { - u8 *pktdata = (u8 *)(skb->data); - struct ethhdr *eh = (struct ethhdr *)pktdata; - - if (is_multicast_ether_addr(eh->h_dest)) - drvr->tx_multicast++; - if (ntohs(eh->h_proto) == ETH_P_PAE) - atomic_inc(&drvr->pend_8021x_cnt); + /* validate length for ether packet */ + if (skb->len < sizeof(*eh)) { + ret = -EINVAL; + dev_kfree_skb(skb); + goto done; } + /* handle ethernet header */ + eh = (struct ethhdr *)(skb->data); + if (is_multicast_ether_addr(eh->h_dest)) + drvr->tx_multicast++; + if (ntohs(eh->h_proto) == ETH_P_PAE) + atomic_inc(&drvr->pend_8021x_cnt); + /* If the protocol uses a data header, apply it */ brcmf_proto_hdrpush(drvr, ifp->idx, skb); -- 2.7.4