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| author | Patrick McHardy <kaber@trash.net> | 2008-04-14 11:15:52 +0200 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2008-04-14 11:15:52 +0200 |
| commit | 5f7da4d26d421f3bdf10c3bbdb86ffc3a12a84f2 (patch) | |
| tree | 67c6cbeaa4005d5410d2f9dd02b9802b6ddf8beb | |
| parent | dd13b010368f85dfa59364ba87bfe8ae930b2832 (diff) | |
| download | linux-5f7da4d26d421f3bdf10c3bbdb86ffc3a12a84f2.tar.bz2 | |
[NETFILTER]: nf_conntrack_tcp: catch invalid state updates over ctnetlink
Invalid states can cause out-of-bound memory accesses of the state table.
Also don't insist on having a new state contained in the netlink message.
Signed-off-by: Patrick McHardy <kaber@trash.net>
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_tcp.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 62567959b66e..57831c75fa9f 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -1129,11 +1129,13 @@ static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) if (err < 0) return err; - if (!tb[CTA_PROTOINFO_TCP_STATE]) + if (tb[CTA_PROTOINFO_TCP_STATE] && + nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX) return -EINVAL; write_lock_bh(&tcp_lock); - ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); + if (tb[CTA_PROTOINFO_TCP_STATE]) + ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { struct nf_ct_tcp_flags *attr = |