From patchwork Thu May 19 01:19:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Guozihua (Scott)" X-Patchwork-Id: 12854446 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 089D7C433EF for ; Thu, 19 May 2022 01:21:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232317AbiESBU7 (ORCPT ); Wed, 18 May 2022 21:20:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231502AbiESBU6 (ORCPT ); Wed, 18 May 2022 21:20:58 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A141532058; Wed, 18 May 2022 18:20:54 -0700 (PDT) Received: from dggpemm500024.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4L3X6F67D7zQkGC; Thu, 19 May 2022 09:17:57 +0800 (CST) Received: from huawei.com (10.67.175.31) by dggpemm500024.china.huawei.com (7.185.36.203) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 19 May 2022 09:20:52 +0800 From: GUO Zihua To: CC: , , , , , , Subject: [PATCH v4] crypto: Use struct_size() helper with kmalloc() Date: Thu, 19 May 2022 09:19:18 +0800 Message-ID: <20220519011918.173538-1-guozihua@huawei.com> X-Mailer: git-send-email 2.36.0 MIME-Version: 1.0 X-Originating-IP: [10.67.175.31] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500024.china.huawei.com (7.185.36.203) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Make use of struct_size() helper for structures containing flexible array member instead of sizeof() which prevents potential issues, as well as increase readability. Reference: https://lore.kernel.org/all/CAHk-=wiGWjxs7EVUpccZEi6esvjpHJdgHQ=vtUeJ5crL62hx9A@mail.gmail.com/ Signed-off-by: GUO Zihua Reviewed-by: Gustavo A. R. Silva Reviewed-by: Kees Cook --- v4: Change subject from "in kmalloc" to "with kmalloc" following David's suggestion. Added Kees' review-by. v3: Update commit message according to Gustavo's review. v2: Use size_add() helper following Kees Cook's suggestion. --- crypto/asymmetric_keys/asymmetric_type.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c index 41a2f0eb4ce4..e020222b1fe5 100644 --- a/crypto/asymmetric_keys/asymmetric_type.c +++ b/crypto/asymmetric_keys/asymmetric_type.c @@ -152,7 +152,7 @@ struct asymmetric_key_id *asymmetric_key_generate_id(const void *val_1, { struct asymmetric_key_id *kid; - kid = kmalloc(sizeof(struct asymmetric_key_id) + len_1 + len_2, + kid = kmalloc(struct_size(kid, data, size_add(len_1, len_2)), GFP_KERNEL); if (!kid) return ERR_PTR(-ENOMEM); @@ -244,7 +244,7 @@ struct asymmetric_key_id *asymmetric_key_hex_to_key_id(const char *id) if (asciihexlen & 1) return ERR_PTR(-EINVAL); - match_id = kmalloc(sizeof(struct asymmetric_key_id) + asciihexlen / 2, + match_id = kmalloc(struct_size(match_id, data, asciihexlen / 2), GFP_KERNEL); if (!match_id) return ERR_PTR(-ENOMEM);