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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_MUTT 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 CE2B4C4360F for ; Wed, 3 Apr 2019 16:46:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A01A92082C for ; Wed, 3 Apr 2019 16:46:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728662AbfDCQqV (ORCPT ); Wed, 3 Apr 2019 12:46:21 -0400 Received: from gateway34.websitewelcome.com ([192.185.149.222]:18679 "EHLO gateway34.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727677AbfDCQqO (ORCPT ); Wed, 3 Apr 2019 12:46:14 -0400 Received: from cm12.websitewelcome.com (cm12.websitewelcome.com [100.42.49.8]) by gateway34.websitewelcome.com (Postfix) with ESMTP id D1F726FAB1 for ; Wed, 3 Apr 2019 11:46:12 -0500 (CDT) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id Bj1ghZKX5iQerBj1ghKKjq; Wed, 03 Apr 2019 11:46:12 -0500 X-Authority-Reason: nr=8 Received: from [189.250.114.183] (port=42264 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.91) (envelope-from ) id 1hBj1f-001ckO-SY; Wed, 03 Apr 2019 11:46:12 -0500 Date: Wed, 3 Apr 2019 11:46:11 -0500 From: "Gustavo A. R. Silva" To: Arend van Spriel , Franky Lin , Hante Meuleman , Chi-Hsien Lin , Wright Feng , Kalle Valo , "David S. Miller" Cc: linux-wireless@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, brcm80211-dev-list@cypress.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH][next] brcmfmac: Use struct_size() in kzalloc() Message-ID: <20190403164611.GA29107@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: 189.250.114.183 X-Source-L: No X-Exim-ID: 1hBj1f-001ckO-SY X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [189.250.114.183]:42264 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 29 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@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 foo { int stuff; struct boo entry[]; }; size = sizeof(struct foo) + count * sizeof(struct boo); instance = kzalloc(size, GFP_KERNEL) Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL) Notice that, in this case, variable reqsz is not necessary, hence it is removed. This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c index 8209a42dea72..07b3ba949da5 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c @@ -711,7 +711,6 @@ brcmf_fw_alloc_request(u32 chip, u32 chiprev, size_t mp_path_len; u32 i, j; char end = '\0'; - size_t reqsz; for (i = 0; i < table_size; i++) { if (mapping_table[i].chipid == chip && @@ -726,8 +725,7 @@ brcmf_fw_alloc_request(u32 chip, u32 chiprev, return NULL; } - reqsz = sizeof(*fwreq) + n_fwnames * sizeof(struct brcmf_fw_item); - fwreq = kzalloc(reqsz, GFP_KERNEL); + fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL); if (!fwreq) return NULL; -- 2.21.0