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

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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>
This commit is contained in:
Patrick McHardy 2009-12-01 15:53:57 -08:00 • committed by David S. Miller
parent 7e8f44f8d4
commit b2722b1c3a
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ip_output.c
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@ -501,8 +501,8 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
if (skb->sk) { if (skb->sk) {
frag->sk = skb->sk; frag->sk = skb->sk;
frag->destructor = sock_wfree; frag->destructor = sock_wfree;
truesizes += frag->truesize;
} }
truesizes += frag->truesize;
} }
/* Everything is OK. Generate! */ /* Everything is OK. Generate! */