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[PATCH 4.4 091/117] crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey path

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  [PATCH 4.4 091/117] crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey path Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-02-15 01:30 +0100

#1334009 — [PATCH 4.4 091/117] crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey path

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Herbert Xu <herbert@gondor.apana.org.au>

commit 6a935170a980024dd29199e9dbb5c4da4767a1b9 upstream.

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

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 crypto/af_alg.c         |    9 ++++++++-
 include/crypto/if_alg.h |    1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -133,6 +133,12 @@ void af_alg_release_parent(struct sock *
 	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, struc
 	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, struc
 		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;
--- 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;

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