diff options
| author | Patrick McHardy <kaber@trash.net> | 2007-01-10 08:04:47 +0100 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2007-02-05 08:31:40 -0800 |
| commit | c1e8b113af91786cba47b948dd470d8381972175 (patch) | |
| tree | ce86c8e92ba615e07e600f7cb82bce4f6428f500 | |
| parent | 8c10ebbf6838583183d2846b7d61742704b8b055 (diff) | |
[PATCH] 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: Chris Wright <chrisw@sous-sol.org>
| -rw-r--r-- | net/ipv6/netfilter/nf_conntrack_reasm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index bf93c1ea6be..7745caff8c3 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -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; |