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[NETFILTER]: nf_conntrack_ipv6: fix crash when handling fragments 

When IPv6 connection tracking splits up a defragmented packet into
its original fragments, the packets are taken from a list and are
passed to the network stack with skb->next still set. This causes
dev_hard_start_xmit to treat them as GSO fragments, resulting in
a use after free when connection tracking handles the next fragment.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-01-09 14:32:41 -08:00 committed by David S. Miller
parent 656829e2d0
commit f9f02cca25
1 changed files with 2 additions and 0 deletions
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2
net/ipv6/netfilter/nf_conntrack_reasm.c
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@ -835,6 +835,8 @@ void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb,
s->nfct_reasm = skb;
s2 = s->next;
s->next = NULL;
NF_HOOK_THRESH(PF_INET6, hooknum, s, in, out, okfn,
NF_IP6_PRI_CONNTRACK_DEFRAG + 1);
s = s2;