linux-kernel - [PATCH 3.12 061/142] crypto: af_alg - Fix socket double-free when accept fails

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Message-Id: <b9da7c51a11a2e7b625122905109e8737fcfbe07.1456308281.git.jslaby@suse.cz>
Date:	Wed, 24 Feb 2016 11:04:16 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 061/142] crypto: af_alg - Fix socket double-free when accept fails

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

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

===============

commit a383292c86663bbc31ac62cc0c04fc77504636a6 upstream.

When we fail an accept(2) call we will end up freeing the socket
twice, once due to the direct sk_free call and once again through
newsock.

This patch fixes this by removing the sk_free call.

Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 crypto/af_alg.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index d7fefeb3d1a7..0ca108f3c840 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -275,10 +275,8 @@ int af_alg_accept(struct sock *sk, struct socket *newsock)
 	security_sk_clone(sk, sk2);
 
 	err = type->accept(ask->private, sk2);
-	if (err) {
-		sk_free(sk2);
+	if (err)
 		goto unlock;
-	}
 
 	sk2->sk_family = PF_ALG;
 
-- 
2.7.1