Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754380AbbLIJkA (ORCPT ); Wed, 9 Dec 2015 04:40:00 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:45190 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754354AbbLIJj5 (ORCPT ); Wed, 9 Dec 2015 04:39:57 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Herbert Xu , Luis Henriques Subject: [PATCH 3.16.y-ckt 051/126] crypto: algif_hash - Only export and import on sockets with data Date: Wed, 9 Dec 2015 09:37:01 +0000 Message-Id: <1449653896-5236-52-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1449653896-5236-1-git-send-email-luis.henriques@canonical.com> References: <1449653896-5236-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1832 Lines: 59 3.16.7-ckt21 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Herbert Xu 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 Signed-off-by: Herbert Xu Tested-by: Stephan Mueller Signed-off-by: Luis Henriques --- 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 850246206b12..a68b56a368a8 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) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/