netfilter: ctnetlink: fix crash during expectation creation

This patch fixes a possible crash due to the missing initialization
of the expectation class when nf_ct_expect_related() is called.

Reported-by: BORBELY Zoltan <bozo@andrews.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index cb78aa00399e..ed6d873ad384 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1780,6 +1780,7 @@ ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
                 goto out;
         }
 
+        exp->class = 0;
         exp->expectfn = NULL;
         exp->flags = 0;
         exp->master = ct;