Patch "netfilter: nfnetlink_queue: fix secctx memory leak" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

netfilter: nfnetlink_queue: fix secctx memory leak

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
netfilter-nfnetlink_queue-fix-secctx-memory-leak.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Liping Zhang <[email protected]>
Date: Tue, 28 Mar 2017 22:59:25 +0800
Subject: netfilter: nfnetlink_queue: fix secctx memory leak

From: Liping Zhang <[email protected]>

[ Upstream commit 77c1c03c5b8ef28e55bb0aff29b1e006037ca645 ]

We must call security_release_secctx to free the memory returned by security_secid_to_secctx, otherwise memory may be leaked forever.

---
 net/netfilter/nfnetlink_queue.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

@@ -390,7 +390,7 @@ nfqnl_build_packet_message(struct net *n
 				  GFP_ATOMIC);
 	if (!skb) {
 		skb_tx_error(entskb);
-		return NULL;
+		goto nlmsg_failure;
 	}
 
 	nlh = nlmsg_put(skb, 0, 0,

@@ -399,7 +399,7 @@ nfqnl_build_packet_message(struct net *n
 	if (!nlh) {
 		skb_tx_error(entskb);
 		kfree_skb(skb);
-		return NULL;
+		goto nlmsg_failure;
 	}
 	nfmsg = nlmsg_data(nlh);
 	nfmsg->nfgen_family = entry->state.pf;

@@ -542,12 +542,17 @@ nfqnl_build_packet_message(struct net *n
 	}
 
 	nlh->nlmsg_len = skb->len;
+	if (seclen)
+		security_release_secctx(secdata, seclen);
 	return skb;
 
 nla_put_failure:
 	skb_tx_error(entskb);
 	kfree_skb(skb);
 	net_err_ratelimited("nf_queue: error creating packet message\n");
+nlmsg_failure:
+	if (seclen)
+		security_release_secctx(secdata, seclen);
 	return NULL;
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/netfilter-nfnetlink_queue-fix-secctx-memory-leak.patch queue-4.4/netfilter-nfnl_cthelper-fix-runtime-expectation-policy-updates.patch queue-4.4/netfilter-nfnl_cthelper-fix-a-race-when-walk-the-nf_ct_helper_hash-table.patch