linux-kernel - [PATCH 3.4 024/125] crypto: algif_hash - Only export and import on sockets with data

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Message-Id: <1476275641-4697-24-git-send-email-lizf@kernel.org>
Date:   Wed, 12 Oct 2016 20:32:20 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 024/125] crypto: algif_hash - Only export and import on sockets with data

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

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 4afa5f9617927453ac04b24b584f6c718dfb4f45 upstream.

The hash_accept call fails to work on sockets that have not received
any data.  For some algorithm implementations it may cause crashes.

This patch fixes this by ensuring that we only export and import on
sockets that have received data.

Reported-by: Harsh Jain <harshjain.prof@...il.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Tested-by: Stephan Mueller <smueller@...onox.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 crypto/algif_hash.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 8502462..a68b56a 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -192,9 +192,14 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
 	struct sock *sk2;
 	struct alg_sock *ask2;
 	struct hash_ctx *ctx2;
+	bool more;
 	int err;
 
-	err = crypto_ahash_export(req, state);
+	lock_sock(sk);
+	more = ctx->more;
+	err = more ? crypto_ahash_export(req, state) : 0;
+	release_sock(sk);
+
 	if (err)
 		return err;
 
@@ -205,7 +210,10 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
 	sk2 = newsock->sk;
 	ask2 = alg_sk(sk2);
 	ctx2 = ask2->private;
-	ctx2->more = 1;
+	ctx2->more = more;
+
+	if (!more)
+		return err;
 
 	err = crypto_ahash_import(&ctx2->req, state);
 	if (err) {
-- 
1.9.1