netfilter: ctnetlink: report error if event message allocation fails

This patch fixes an inconsistency that results in no error reports
to user-space listeners if we fail to allocate the event message.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 6 insertions, 4 deletions

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index c6439c77953c..0ea36e0c8a0e 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -512,7 +512,7 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
 
         skb = ctnetlink_alloc_skb(tuple(ct, IP_CT_DIR_ORIGINAL), GFP_ATOMIC);
         if (!skb)
-                return NOTIFY_DONE;
+                goto errout;
 
         b = skb->tail;
 
@@ -591,8 +591,9 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
 nla_put_failure:
         rcu_read_unlock();
 nlmsg_failure:
-        nfnetlink_set_err(0, group, -ENOBUFS);
         kfree_skb(skb);
+errout:
+        nfnetlink_set_err(0, group, -ENOBUFS);
         return NOTIFY_DONE;
 }
 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
@@ -1564,7 +1565,7 @@ static int ctnetlink_expect_event(struct notifier_block *this,
 
         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
         if (!skb)
-                return NOTIFY_DONE;
+                goto errout;
 
         b = skb->tail;
 
@@ -1589,8 +1590,9 @@ static int ctnetlink_expect_event(struct notifier_block *this,
 nla_put_failure:
         rcu_read_unlock();
 nlmsg_failure:
-        nfnetlink_set_err(0, 0, -ENOBUFS);
         kfree_skb(skb);
+errout:
+        nfnetlink_set_err(0, 0, -ENOBUFS);
         return NOTIFY_DONE;
 }
 #endif