nfnetlink_log: fix possible NULL pointer dereference

[NETFILTER]: nfnetlink_log: fix possible NULL pointer dereference

Eliminate possible NULL pointer dereference in nfulnl_recv_config().

Signed-off-by: Michal Miroslaw <mirq-linux@rere.qmqm.pl>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 0b870d6df100d19ca6852b6b7bbc83b1e6197386..5c2980d07b7f7829aa10ca6c6e4e2963f86b6170 100644 (file)
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -867,6 +867,9 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
                        ret = -EINVAL;
                        break;
                }
+
+               if (!inst)
+                       goto out;
        } else {
                if (!inst) {
                        UDEBUG("no config command, and no instance for "
@@ -920,6 +923,7 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
 
 out_put:
        instance_put(inst);
+out:
        return ret;
 }