From patchwork Mon Nov 14 23:01:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 13042892 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 4524FC4332F for ; Mon, 14 Nov 2022 23:01:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236990AbiKNXBd (ORCPT ); Mon, 14 Nov 2022 18:01:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231355AbiKNXBb (ORCPT ); Mon, 14 Nov 2022 18:01:31 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7B63DF3A; Mon, 14 Nov 2022 15:01:30 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 7229AB815BA; Mon, 14 Nov 2022 23:01:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 428AEC433C1; Mon, 14 Nov 2022 23:01:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668466888; bh=7vxLPswcjDt5sJNpB3JWA/pifmsgpJ0fVOFRK4RZzQg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Uv1RHymXyPi1Y+qXIJVQkExNcPxqHsB4Rf6B8xEIz99EdAoVmNLTmGAc8VvARV7ak b80sjhPtAycLcDPGX9PbFNZiOu68a1s46vLmQ3v8iQpXrfbyzl/3xMJ96NBeIMkFbo Nyx36gwejzmGhoPwt7VO3tqu1JC24D+7PQLRyUVTq3r64o9+kL8bBTh2/v9KQ4jJNF lLaVlXTavAu6mnLNgRA44g5iX6Vlb8vbD8ihOmc0u1ohML/ispTztME2YzfPIFU0sc dn98bt5YraBXDQfGt+OxhSTjj1kZmv2TUlHvQqSSS2iqDkokHxIcgcQzhr+EUp7f1u BcLOkVGx2eHqA== Date: Mon, 14 Nov 2022 17:01:11 -0600 From: "Gustavo A. R. Silva" To: Arend van Spriel , Franky Lin , Hante Meuleman , Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH 1/2][next] wifi: brcmfmac: Replace one-element array with flexible-array member Message-ID: <7694550aa9a2753a73a687f61af9441c8cf52fd7.1668466470.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org One-element arrays are deprecated, and we are replacing them with flexible array members instead. So, replace one-element array with flexible-array member in struct brcmf_gscan_config. Important to mention is that doing a build before/after this patch results in no binary output differences. This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy() and help us make progress towards globally enabling -fstrict-flex-arrays=3 [1]. Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/241 Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h | 2 +- drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h index f518e025d6e4..62f65dc6a3b9 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h @@ -1049,7 +1049,7 @@ struct brcmf_gscan_config { u8 count_of_channel_buckets; u8 retry_threshold; __le16 lost_ap_window; - struct brcmf_gscan_bucket_config bucket[1]; + struct brcmf_gscan_bucket_config bucket[]; }; /** diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c index 170c61c8136c..7c5da506637f 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c @@ -405,7 +405,7 @@ static int brcmf_pno_config_sched_scans(struct brcmf_if *ifp) if (n_buckets < 0) return n_buckets; - gsz = sizeof(*gscan_cfg) + (n_buckets - 1) * sizeof(*buckets); + gsz = sizeof(*gscan_cfg) + n_buckets * sizeof(*buckets); gscan_cfg = kzalloc(gsz, GFP_KERNEL); if (!gscan_cfg) { err = -ENOMEM; From patchwork Mon Nov 14 23:02:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 13042903 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 D3469C4167B for ; Mon, 14 Nov 2022 23:02:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237499AbiKNXC1 (ORCPT ); Mon, 14 Nov 2022 18:02:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236787AbiKNXCZ (ORCPT ); Mon, 14 Nov 2022 18:02:25 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 677301AD95; Mon, 14 Nov 2022 15:02:24 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0341461496; Mon, 14 Nov 2022 23:02:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4DE1C43470; Mon, 14 Nov 2022 23:02:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668466943; bh=atvqHdQO4CQz5dyA9Aq/ZbZb/2LT5b1pm3IB1f6BEtc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=h1RAO+mYJIKOiqI9PduVuH5ox7UFRxuY8OrEa3EcVGGJGjUlJfcX1lSB/nCVt1ao+ HKeDoFnSR22leKuODBTvqMFdBEaRizKnHXvS+ZQYRoIVaynfBGK48r70/MGDo+9deS SYNTdXVP9Yr7pnn/Zf+xEpcvFUmDVGU2c1GQAGHg9+6kxh5WKOSju7ANg2c64i0KJB thUfF+9r2zxlZ+cDb058lle+BnPgzYJHFg5R6WTe//2CSV9/N4RI2ARQh+CMHrQp08 99Ul7qUWHWQPrDYNM7G3AvDWz9zQkWAH+c/E29bKc/Y1E+ANkShpNYgf5sgg8HRX6L Bhf/lknvkid6Q== Date: Mon, 14 Nov 2022 17:02:06 -0600 From: "Gustavo A. R. Silva" To: Arend van Spriel , Franky Lin , Hante Meuleman , Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH 2/2][next] wifi: brcmfmac: Use struct_size() and array_size() in code ralated to struct brcmf_gscan_config Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Prefer struct_size() over open-coded versions of idiom: sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count where count is the max number of items the flexible array is supposed to contain. Also, use array_size() in call to memcpy(). Link: https://github.com/KSPP/linux/issues/160 Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c index 7c5da506637f..05f66ab13bed 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pno.c @@ -405,7 +405,7 @@ static int brcmf_pno_config_sched_scans(struct brcmf_if *ifp) if (n_buckets < 0) return n_buckets; - gsz = sizeof(*gscan_cfg) + n_buckets * sizeof(*buckets); + gsz = struct_size(gscan_cfg, bucket, n_buckets); gscan_cfg = kzalloc(gsz, GFP_KERNEL); if (!gscan_cfg) { err = -ENOMEM; @@ -434,8 +434,8 @@ static int brcmf_pno_config_sched_scans(struct brcmf_if *ifp) gscan_cfg->flags = BRCMF_GSCAN_CFG_ALL_BUCKETS_IN_1ST_SCAN; gscan_cfg->count_of_channel_buckets = n_buckets; - memcpy(&gscan_cfg->bucket[0], buckets, - n_buckets * sizeof(*buckets)); + memcpy(gscan_cfg->bucket, buckets, + array_size(n_buckets, sizeof(*buckets))); err = brcmf_fil_iovar_data_set(ifp, "pfn_gscan_cfg", gscan_cfg, gsz);