[4.2.y-ckt stable] Patch "crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey path" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey path

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt3.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From c9e5b7f442b71fa2ace33feeb12e5f86f5f9b8c5 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert at gondor.apana.org.au>
Date: Wed, 13 Jan 2016 14:59:03 +0800
Subject: crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey
 path

commit 6a935170a980024dd29199e9dbb5c4da4767a1b9 upstream.

This patch allows af_alg_release_parent to be called even for
nokey sockets.

Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 crypto/af_alg.c         | 9 ++++++++-
 include/crypto/if_alg.h | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 6566d2e..e7cb836 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -133,6 +133,12 @@ void af_alg_release_parent(struct sock *sk)
 	bool last;

 	sk = ask->parent;
+
+	if (ask->nokey_refcnt && !ask->refcnt) {
+		sock_put(sk);
+		return;
+	}
+
 	ask = alg_sk(sk);

 	lock_sock(sk);
@@ -268,8 +274,8 @@ int af_alg_accept(struct sock *sk, struct socket *newsock)
 	struct alg_sock *ask = alg_sk(sk);
 	const struct af_alg_type *type;
 	struct sock *sk2;
+	unsigned int nokey;
 	int err;
-	bool nokey;

 	lock_sock(sk);
 	type = ask->type;
@@ -302,6 +308,7 @@ int af_alg_accept(struct sock *sk, struct socket *newsock)
 		sock_hold(sk);
 	alg_sk(sk2)->parent = sk;
 	alg_sk(sk2)->type = type;
+	alg_sk(sk2)->nokey_refcnt = nokey;

 	newsock->ops = type->ops;
 	newsock->state = SS_CONNECTED;
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index df82844..a2bfd78 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -31,6 +31,7 @@ struct alg_sock {
 	struct sock *parent;

 	unsigned int refcnt;
+	unsigned int nokey_refcnt;

 	const struct af_alg_type *type;
 	void *private;
--
1.9.1