vlan: should take into account needed_headroom
commit01b7e60bf848901c3a95794c90888e4e33ab751f
authorEric Dumazet <eric.dumazet@gmail.com>
Fri, 18 Mar 2011 00:27:27 +0000 (18 00:27 +0000)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 21 Apr 2011 21:32:36 +0000 (21 14:32 -0700)
tree8c5fbbdeb5269cfb04ed74968b2fbd81befda7d9
parente5a1f3787f4b43e828de2818faa6a0f658b87a63
vlan: should take into account needed_headroom

[ Upstream commit d870bfb9d366c5d466c0f5419a4ec95a3f71ea8a ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
net/8021q/vlan_dev.c