tree b3f3fbf1d9b2c80bdc2d1a7a7786498fc2b62d64
parent 7e8f44f8d4fa9bb35e32c161fbcdbd6b9e6400e3
author Patrick McHardy <kaber@trash.net> 1259711637 -0800
committer David S. Miller <davem@davemloft.net> 1259711637 -0800

ip_fragment: also adjust skb->truesize for packets not owned by a socket

When a large packet gets reassembled by ip_defrag(), the head skb
accounts for all the fragments in skb->truesize. If this packet is
refragmented again, skb->truesize is not re-adjusted to reflect only
the head size since its not owned by a socket. If the head fragment
then gets recycled and reused for another received fragment, it might
exceed the defragmentation limits due to its large truesize value.

skb_recycle_check() explicitly checks for linear skbs, so any recycled
skb should reflect its true size in skb->truesize. Change ip_fragment()
to also adjust the truesize value of skbs not owned by a socket.

Reported-and-tested-by: Ben Menchaca <ben@bigfootnetworks.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>