[PATCH 4.3 160/200] crypto: af_alg - Add nokey compatibility path

[Greg Kroah-Hartman]

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

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

From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

commit 37766586c965d63758ad542325a96d5384f4a8c9 upstream.

This patch adds a compatibility path to support old applications
that do acept(2) before setkey.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 crypto/af_alg.c         |   13 ++++++++++++-
 include/crypto/if_alg.h |    2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -76,6 +76,8 @@ int af_alg_register_type(const struct af
 		goto unlock;
 
 	type->ops->owner = THIS_MODULE;
+	if (type->ops_nokey)
+		type->ops_nokey->owner = THIS_MODULE;
 	node->type = type;
 	list_add(&node->list, &alg_types);
 	err = 0;
@@ -267,6 +269,7 @@ int af_alg_accept(struct sock *sk, struc
 	const struct af_alg_type *type;
 	struct sock *sk2;
 	int err;
+	bool nokey;
 
 	lock_sock(sk);
 	type = ask->type;
@@ -285,12 +288,17 @@ int af_alg_accept(struct sock *sk, struc
 	security_sk_clone(sk, sk2);
 
 	err = type->accept(ask->private, sk2);
+
+	nokey = err == -ENOKEY;
+	if (nokey && type->accept_nokey)
+		err = type->accept_nokey(ask->private, sk2);
+
 	if (err)
 		goto unlock;
 
 	sk2->sk_family = PF_ALG;
 
-	if (!ask->refcnt++)
+	if (nokey || !ask->refcnt++)
 		sock_hold(sk);
 	alg_sk(sk2)->parent = sk;
 	alg_sk(sk2)->type = type;
@@ -298,6 +306,9 @@ int af_alg_accept(struct sock *sk, struc
 	newsock->ops = type->ops;
 	newsock->state = SS_CONNECTED;
 
+	if (nokey)
+		newsock->ops = type->ops_nokey;
+
 	err = 0;
 
 unlock:
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -52,9 +52,11 @@ struct af_alg_type {
 	void (*release)(void *private);
 	int (*setkey)(void *private, const u8 *key, unsigned int keylen);
 	int (*accept)(void *private, struct sock *sk);
+	int (*accept_nokey)(void *private, struct sock *sk);
 	int (*setauthsize)(void *private, unsigned int authsize);
 
 	struct proto_ops *ops;
+	struct proto_ops *ops_nokey;
 	struct module *owner;
 	char name[14];
 };