From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756255AbcBWWBz (ORCPT ); Tue, 23 Feb 2016 17:01:55 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:41614 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755497AbcBWVov (ORCPT ); Tue, 23 Feb 2016 16:44:51 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Herbert Xu" Date: Tue, 23 Feb 2016 21:42:03 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 50/67] crypto: algif_skcipher - Do not dereference ctx without socket lock In-Reply-To: X-SA-Exim-Connect-IP: 92.40.248.141 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.78-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Herbert Xu commit 6454c2b83f719057069777132b13949e4c6b6350 upstream. Any access to non-constant bits of the private context must be done under the socket lock, in particular, this includes ctx->req. This patch moves such accesses under the lock, and fetches the tfm from the parent socket which is guaranteed to be constant, rather than from ctx->req. Signed-off-by: Herbert Xu [bwh: Backported to 3.2: - Drop changes to skcipher_recvmsg_async - s/skcipher/ablkcipher/ in many places - s/skc->skcipher/skc->base/] Signed-off-by: Ben Hutchings --- crypto/algif_skcipher.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -249,8 +249,11 @@ static int skcipher_sendmsg(struct kiocb { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); + struct sock *psk = ask->parent; + struct alg_sock *pask = alg_sk(psk); struct skcipher_ctx *ctx = ask->private; - struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req); + struct ablkcipher_tfm *skc = pask->private; + struct crypto_ablkcipher *tfm = skc->base; unsigned ivsize = crypto_ablkcipher_ivsize(tfm); struct skcipher_sg_list *sgl; struct af_alg_control con = {};