net: reset mac header in dev_start_xmit()
On 64 bit arches : There is a off-by-one error in qdisc_pkt_len_init() because mac_header is not set in xmit path. skb_mac_header() returns an out of bound value that was harmless because hdr_len is an 'unsigned int' On 32bit arches, the error is abysmal. This patch is also a prereq for "macvlan: add multicast filter" Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Ben Greear <greearb@candelatech.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2835,6 +2835,8 @@ int dev_queue_xmit(struct sk_buff *skb)
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struct Qdisc *q;
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int rc = -ENOMEM;
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skb_reset_mac_header(skb);
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/* Disable soft irqs for various locks below. Also
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* stops preemption for RCU.
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*/
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