vlan: should take into account needed_headroom
authorEric Dumazet <eric.dumazet@gmail.com>
Fri, 18 Mar 2011 00:27:27 +0000 (00:27 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 18 Mar 2011 22:13:12 +0000 (15:13 -0700)
commitd870bfb9d366c5d466c0f5419a4ec95a3f71ea8a
tree1058c527072d026721499e646765da0e92260444
parent3a7da39d165e0c363c294feec119db1427032afd
vlan: should take into account needed_headroom

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>
net/8021q/vlan_dev.c