From patchwork Fri Dec 14 20:29:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Coelho X-Patchwork-Id: 10731633 X-Patchwork-Delegate: luca@coelho.fi Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DA0FB14E2 for ; Fri, 14 Dec 2018 20:30:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 144782D83C for ; Fri, 14 Dec 2018 20:30:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 08E352D863; Fri, 14 Dec 2018 20:30:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 972B82D83C for ; Fri, 14 Dec 2018 20:30:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730915AbeLNUaV (ORCPT ); Fri, 14 Dec 2018 15:30:21 -0500 Received: from paleale.coelho.fi ([176.9.41.70]:42050 "EHLO farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730713AbeLNUaU (ORCPT ); Fri, 14 Dec 2018 15:30:20 -0500 Received: from 91-156-4-241.elisa-laajakaista.fi ([91.156.4.241] helo=localhost.localdomain) by farmhouse.coelho.fi with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.91) (envelope-from ) id 1gXu5z-0002RG-G6; Fri, 14 Dec 2018 22:30:03 +0200 From: Luca Coelho To: kvalo@codeaurora.org Cc: linux-wireless@vger.kernel.org, "Gustavo A. R. Silva" , Luca Coelho Date: Fri, 14 Dec 2018 22:29:43 +0200 Message-Id: <20181214202945.32375-17-luca@coelho.fi> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181214202945.32375-1-luca@coelho.fi> References: <20181214202945.32375-1-luca@coelho.fi> MIME-Version: 1.0 Subject: [PATCH 16/18] iwlwifi: mvm: d3: use struct_size() in kzalloc() Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Gustavo A. R. Silva" 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; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, 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); This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/d3.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c index 9b018d00f78f..01b5338201d6 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c @@ -1811,8 +1811,7 @@ static void iwl_mvm_query_netdetect_reasons(struct iwl_mvm *mvm, n_matches = 0; } - net_detect = kzalloc(sizeof(*net_detect) + - (n_matches * sizeof(net_detect->matches[0])), + net_detect = kzalloc(struct_size(net_detect, matches, n_matches), GFP_KERNEL); if (!net_detect || !n_matches) goto out_report_nd; @@ -1827,8 +1826,7 @@ static void iwl_mvm_query_netdetect_reasons(struct iwl_mvm *mvm, for (j = 0; j < SCAN_OFFLOAD_MATCHING_CHANNELS_LEN; j++) n_channels += hweight8(fw_match->matching_channels[j]); - match = kzalloc(sizeof(*match) + - (n_channels * sizeof(*match->channels)), + match = kzalloc(struct_size(match, channels, n_channels), GFP_KERNEL); if (!match) goto out_report_nd;