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| author | Patrick McHardy <kaber@trash.net> | 2007-01-09 14:32:41 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-01-09 14:32:41 -0800 |
| commit | f9f02cca25acf33e5853c6b3cbb0c7146312783f (patch) | |
| tree | 54bd83070a561f2c479196820e18cd097e9fcc40 | |
| parent | 656829e2d052b1da4a72aa2ac39ad733a78530ce (diff) | |
| download | linux-f9f02cca25acf33e5853c6b3cbb0c7146312783f.tar.gz linux-f9f02cca25acf33e5853c6b3cbb0c7146312783f.tar.bz2 linux-f9f02cca25acf33e5853c6b3cbb0c7146312783f.zip | |
[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>
| -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 37e5fca923aa..d9c15402ba66 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; |