[PATCH 3.10 18/18] Revert: "crypto: af_alg - Disallow bind/setkey/... after accept(2)"

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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

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

This reverts commit 5a707f0972e1c9d8a4a921ddae79d0f9dc36a341 which is
commit c840ac6af3f8713a71b4d2363419145760bd6044 upstream.

It's been widely reported that this patch breaks existing userspace
applications when backported to the stable kernel releases.  As no fix
seems to be forthcoming, just revert it to let systems work again.

Reported-by: "J. Paul Reed" <preed@sigkill.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 crypto/af_alg.c         |   35 +++--------------------------------
 include/crypto/if_alg.h |    8 +++++---
 2 files changed, 8 insertions(+), 35 deletions(-)

--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -125,23 +125,6 @@ int af_alg_release(struct socket *sock)
 }
 EXPORT_SYMBOL_GPL(af_alg_release);
 
-void af_alg_release_parent(struct sock *sk)
-{
-	struct alg_sock *ask = alg_sk(sk);
-	bool last;
-
-	sk = ask->parent;
-	ask = alg_sk(sk);
-
-	lock_sock(sk);
-	last = !--ask->refcnt;
-	release_sock(sk);
-
-	if (last)
-		sock_put(sk);
-}
-EXPORT_SYMBOL_GPL(af_alg_release_parent);
-
 static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 {
 	struct sock *sk = sock->sk;
@@ -149,7 +132,6 @@ static int alg_bind(struct socket *sock,
 	struct sockaddr_alg *sa = (void *)uaddr;
 	const struct af_alg_type *type;
 	void *private;
-	int err;
 
 	if (sock->state == SS_CONNECTED)
 		return -EINVAL;
@@ -175,22 +157,16 @@ static int alg_bind(struct socket *sock,
 		return PTR_ERR(private);
 	}
 
-	err = -EBUSY;
 	lock_sock(sk);
-	if (ask->refcnt)
-		goto unlock;
 
 	swap(ask->type, type);
 	swap(ask->private, private);
 
-	err = 0;
-
-unlock:
 	release_sock(sk);
 
 	alg_do_release(type, private);
 
-	return err;
+	return 0;
 }
 
 static int alg_setkey(struct sock *sk, char __user *ukey,
@@ -223,15 +199,11 @@ static int alg_setsockopt(struct socket
 	struct sock *sk = sock->sk;
 	struct alg_sock *ask = alg_sk(sk);
 	const struct af_alg_type *type;
-	int err = -EBUSY;
+	int err = -ENOPROTOOPT;
 
 	lock_sock(sk);
-	if (ask->refcnt)
-		goto unlock;
-
 	type = ask->type;
 
-	err = -ENOPROTOOPT;
 	if (level != SOL_ALG || !type)
 		goto unlock;
 
@@ -280,8 +252,7 @@ int af_alg_accept(struct sock *sk, struc
 
 	sk2->sk_family = PF_ALG;
 
-	if (!ask->refcnt++)
-		sock_hold(sk);
+	sock_hold(sk);
 	alg_sk(sk2)->parent = sk;
 	alg_sk(sk2)->type = type;
 
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -30,8 +30,6 @@ struct alg_sock {
 
 	struct sock *parent;
 
-	unsigned int refcnt;
-
 	const struct af_alg_type *type;
 	void *private;
 };
@@ -66,7 +64,6 @@ int af_alg_register_type(const struct af
 int af_alg_unregister_type(const struct af_alg_type *type);
 
 int af_alg_release(struct socket *sock);
-void af_alg_release_parent(struct sock *sk);
 int af_alg_accept(struct sock *sk, struct socket *newsock);
 
 int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
@@ -83,6 +80,11 @@ static inline struct alg_sock *alg_sk(st
 	return (struct alg_sock *)sk;
 }
 
+static inline void af_alg_release_parent(struct sock *sk)
+{
+	sock_put(alg_sk(sk)->parent);
+}
+
 static inline void af_alg_init_completion(struct af_alg_completion *completion)
 {
 	init_completion(&completion->completion);