netfilter: cttimeout: ctnl_timeout_find_get() returns incorrect pointer to type

Compiler did not catch incorrect typing in the rcu hook assignment.

 % nfct add timeout test-tcp inet tcp established 100 close 10 close_wait 10
 % iptables -I OUTPUT -t raw -p tcp -j CT --timeout test-tcp
 dmesg - xt_CT: Timeout policy `test-tcp' can only be used by L3 protocol number 25000

The CT target bails out with incorrect layer 3 protocol number.

Fixes: 6c1fd7dc489d ("netfilter: cttimeout: decouple timeout policy from nfnetlink_cttimeout object")
Reported-by: Harsha Sharma <harshasharmaiitr@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index d46a236cdf31b612f808b33867cd5ee68e70af33..a30f8ba4b89ac427053281936ad3e70750e3a2f0 100644 (file)
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -489,8 +489,8 @@ err:
        return err;
 }
 
-static struct ctnl_timeout *
-ctnl_timeout_find_get(struct net *net, const char *name)
+static struct nf_ct_timeout *ctnl_timeout_find_get(struct net *net,
+                                                  const char *name)
 {
        struct ctnl_timeout *timeout, *matching = NULL;
 
@@ -509,7 +509,7 @@ ctnl_timeout_find_get(struct net *net, const char *name)
                break;
        }
 err:
-       return matching;
+       return matching ? &matching->timeout : NULL;
 }
 
 static void ctnl_timeout_put(struct nf_ct_timeout *t)