genesi/linux-legacy-genesi-1
1
0
Fork 0
mirror of https://github.com/genesi/linux-legacy.git synced 2026-07-08 18:16:13 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
[ Upstream commit b2722b1c3a893ec6021508da15b32282ec79f4da ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Patrick McHardy
2009-12-01 15:53:57 -08:00
committed by Greg Kroah-Hartman
parent ffa495ef3b
commit b1589c33ce
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
net/ipv4/ip_output.c
View File

@@ -500,8 +500,8 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
if (skb->sk) {
frag->sk = skb->sk;
frag->destructor = sock_wfree;
truesizes += frag->truesize;
}
truesizes += frag->truesize;
}
/* Everything is OK. Generate! */