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vlan: should take into account needed_headroom

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Commit c95b819ad7 (gre: Use needed_headroom)
made gre use needed_headroom instead of hard_header_len

This uncover a bug in vlan code.

We should make sure vlan devices take into account their
real_dev->needed_headroom or we risk a crash in ipgre_header(), because
we dont have enough room to push IP header in skb.

Reported-by: Diddi Oscarsson <diddi@diddi.se>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-03-18 00:27:27 +00:00 committed by David S. Miller
parent 3a7da39d16
commit d870bfb9d3
1 changed files with 1 additions and 0 deletions
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net/8021q/vlan_dev.c
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@ -720,6 +720,7 @@ static int vlan_dev_init(struct net_device *dev)
dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
#endif
dev->needed_headroom = real_dev->needed_headroom;
if (real_dev->features & NETIF_F_HW_VLAN_TX) {
dev->header_ops = real_dev->header_ops;
dev->hard_header_len = real_dev->hard_header_len;