diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-07-11 19:22:19 -0700 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-07-15 11:15:21 +0200 |
| commit | baf60efa585c78b269f0097288868a51ccc61f55 (patch) | |
| tree | 8d9202c8b44038254c87f7f03f887073bc976a7c | |
| parent | f09eca8db0184aeb6b9718a987cfb3653ad7c4ae (diff) | |
netfilter: xt_socket: fix broken v0 support
commit 681f130f39e10 ("netfilter: xt_socket: add XT_SOCKET_NOWILDCARD
flag") added a potential NULL dereference if an old iptables package
uses v0 of the match.
Fix this by removing the test on @info in fast path.
IPv6 can remove the test as well, as it uses v1 or v2.
Reported-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/xt_socket.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/net/netfilter/xt_socket.c b/net/netfilter/xt_socket.c index f8b71911037..20b15916f40 100644 --- a/net/netfilter/xt_socket.c +++ b/net/netfilter/xt_socket.c @@ -172,7 +172,7 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par, /* Ignore non-transparent sockets, if XT_SOCKET_TRANSPARENT is used */ - if (info && info->flags & XT_SOCKET_TRANSPARENT) + if (info->flags & XT_SOCKET_TRANSPARENT) transparent = ((sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->transparent) || (sk->sk_state == TCP_TIME_WAIT && @@ -196,7 +196,11 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par, static bool socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par) { - return socket_match(skb, par, NULL); + static struct xt_socket_mtinfo1 xt_info_v0 = { + .flags = 0, + }; + + return socket_match(skb, par, &xt_info_v0); } static bool @@ -314,7 +318,7 @@ socket_mt6_v1_v2(const struct sk_buff *skb, struct xt_action_param *par) /* Ignore non-transparent sockets, if XT_SOCKET_TRANSPARENT is used */ - if (info && info->flags & XT_SOCKET_TRANSPARENT) + if (info->flags & XT_SOCKET_TRANSPARENT) transparent = ((sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->transparent) || (sk->sk_state == TCP_TIME_WAIT && |