netfilter: xtables: fix mangle tables

In POST_ROUTING hook, calling dev_net(in) is going to oops.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

2 files changed, 6 insertions, 2 deletions

diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index 58d7097baa3d..c8333305d631 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -87,7 +87,9 @@ iptable_mangle_hook(unsigned int hook,
 {
         if (hook == NF_INET_LOCAL_OUT)
                 return ipt_local_hook(hook, skb, in, out, okfn);
-
+        if (hook == NF_INET_POST_ROUTING)
+                return ipt_do_table(skb, hook, in, out,
+                                    dev_net(out)->ipv4.iptable_mangle);
         /* PREROUTING/INPUT/FORWARD: */
         return ipt_do_table(skb, hook, in, out,
                             dev_net(in)->ipv4.iptable_mangle);
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
index dc803b7e8e54..b6216dede52c 100644
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -81,7 +81,9 @@ ip6table_mangle_hook(unsigned int hook, struct sk_buff *skb,
 {
         if (hook == NF_INET_LOCAL_OUT)
                 return ip6t_local_out_hook(hook, skb, out, okfn);
-
+        if (hook == NF_INET_POST_ROUTING)
+                return ip6t_do_table(skb, hook, in, out,
+                                     dev_net(out)->ipv6.ip6table_mangle);
         /* INPUT/FORWARD */
         return ip6t_do_table(skb, hook, in, out,
                              dev_net(in)->ipv6.ip6table_mangle);