From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6240DC0650F for ; Tue, 6 Aug 2019 00:11:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3376D2070D for ; Tue, 6 Aug 2019 00:11:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="wDvshsv1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730907AbfHFALy (ORCPT ); Mon, 5 Aug 2019 20:11:54 -0400 Received: from gateway21.websitewelcome.com ([192.185.45.147]:20236 "EHLO gateway21.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728851AbfHFALw (ORCPT ); Mon, 5 Aug 2019 20:11:52 -0400 X-Greylist: delayed 1340 seconds by postgrey-1.27 at vger.kernel.org; Mon, 05 Aug 2019 20:11:51 EDT Received: from cm16.websitewelcome.com (cm16.websitewelcome.com [100.42.49.19]) by gateway21.websitewelcome.com (Postfix) with ESMTP id 3FAC6400C865A for ; Mon, 5 Aug 2019 18:49:30 -0500 (CDT) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id umjKhdP0I4FKpumjKhlpPJ; Mon, 05 Aug 2019 18:49:30 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Type:MIME-Version:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=9li+YhxHo8+AujwqhsMZd9x+rcO10TXeZqodcMKx7qo=; b=wDvshsv1z+1fXiJZtY4PyLHNww TX8STZuvfNMy65c16V2YqeJF4e8e/HsisSBSRMNAYeBJY66xYI/a5XrZfQP5O40mD+yeXeHv8mhGF /W+BkPEqN7tqKgN4uGAsH1ddru52eG7RKMGdhbMA68N7j/W90G6NeAxsM+j0UroIzheN1fD8VsZFI sA/k0BthKK/9Zm04QwPf2oMN8gM7gjlYuj/OllN0eoj7w5ZOZWXvKUz9mCf309++jkyGM+YRn46r6 5P/kqFvhARxma5FJxkO5SiwELWfYONvsDrQNS5FCEC9Xm8TJyI6CRkGjHeBRV/2krkJOt1cspawIF VSuTx2Wg==; Received: from [187.192.11.120] (port=40464 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1humjJ-000yz7-1L; Mon, 05 Aug 2019 18:49:29 -0500 Date: Mon, 5 Aug 2019 18:49:28 -0500 From: "Gustavo A. R. Silva" To: Rob Clark , Sean Paul , David Airlie , Daniel Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] drm/msm: Use struct_size() helper Message-ID: <20190805234928.GA2785@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 187.192.11.120 X-Source-L: No X-Exim-ID: 1humjJ-000yz7-1L X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [187.192.11.120]:40464 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 5 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct msm_gem_submit { ... struct { ... } bos[0]; }; Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes. So, replace the following form: sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0])) with: struct_size(submit, bos, nr_bos) This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/gpu/drm/msm/msm_gem_submit.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index 348f8c2be806..7c17c6154058 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -26,8 +26,8 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev, uint32_t nr_cmds) { struct msm_gem_submit *submit; - uint64_t sz = sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0])) + - ((u64)nr_cmds * sizeof(submit->cmd[0])); + uint64_t sz = struct_size(submit, bos, nr_bos) + + ((u64)nr_cmds * sizeof(submit->cmd[0])); if (sz > SIZE_MAX) return NULL; -- 2.22.0