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    Subject[patch 07/59] NETFILTER: nf_conntrack_ipv6: fix crash when handling fragments
    -stable review patch.  If anyone has any objections, please let us know.

    From: Patrick McHardy <>

    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 <>
    Signed-off-by: Chris Wright <>

    net/ipv6/netfilter/nf_conntrack_reasm.c | 2 ++
    1 file changed, 2 insertions(+)

    --- linux-
    +++ linux-
    @@ -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,
    s = s2;
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      Last update: 2007-02-03 03:57    [W:0.019 / U:3.232 seconds]
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