| Date | Fri, 02 Feb 2007 18:35:11 -0800 | From | Chris Wright <> | Subject | [patch 07/59] NETFILTER: nf_conntrack_ipv6: fix crash when handling fragments |
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-stable review patch. If anyone has any objections, please let us know. ------------------
From: Patrick McHardy <kaber@trash.net>
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> ---
net/ipv6/netfilter/nf_conntrack_reasm.c | 2 ++ 1 file changed, 2 insertions(+)
--- linux-2.6.19.2.orig/net/ipv6/netfilter/nf_conntrack_reasm.c +++ linux-2.6.19.2/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -835,6 +835,8 @@ void nf_ct_frag6_output(unsigned int hoo 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; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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