From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758139AbbLBXNQ (ORCPT ); Wed, 2 Dec 2015 18:13:16 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:47884 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757874AbbLBWzW (ORCPT ); Wed, 2 Dec 2015 17:55:22 -0500 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Herbert Xu , Kamal Mostafa Subject: [PATCH 3.13.y-ckt 46/86] crypto: algif_hash - Only export and import on sockets with data Date: Wed, 2 Dec 2015 14:54:07 -0800 Message-Id: <1449096887-23017-47-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449096887-23017-1-git-send-email-kamal@canonical.com> References: <1449096887-23017-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.13 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.13.11-ckt31 -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: Kamal Mostafa --- 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