From patchwork Fri Apr 7 06:46:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SmFzb24tSkggTGluICjmnpfnnb/npaUp?= X-Patchwork-Id: 13204481 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AF18AC6FD1D for ; Fri, 7 Apr 2023 06:47:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2B37610E7E7; Fri, 7 Apr 2023 06:47:07 +0000 (UTC) Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by gabe.freedesktop.org (Postfix) with ESMTPS id 836DB10E819 for ; Fri, 7 Apr 2023 06:47:05 +0000 (UTC) X-UUID: ff745670d50f11eda9a90f0bb45854f4-20230407 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=z8dlLD1sv9f2NE8zrNy/h9dCS9iBY/r8jXl3iTCVF0I=; b=KRXdx7weIHB5IUlsqggXGIyrg/9LcAzSEcnpKZm8xj5JEAjxnfCY0cvRAE7ldGWuZmpen7WX8jcgOBFksj+yni5FpWNq5jsCwuBRxdyKpTtDLbUiiNDw0+BJnvZGv8MKeY+Y4nHG/x0IjTXmhZhRIA+Ce6w5duzws5YTRe3MDXQ=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.22, REQID:f3c8e788-a68f-428e-a11d-fcbbb5b4b025, IP:0, U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:120426c, CLOUDID:b37b9c2a-564d-42d9-9875-7c868ee415ec, B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0 X-CID-BVR: 0,NGT X-CID-BAS: 0,NGT,0,_ X-UUID: ff745670d50f11eda9a90f0bb45854f4-20230407 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 796966629; Fri, 07 Apr 2023 14:47:00 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs11n2.mediatek.inc (172.21.101.187) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.25; Fri, 7 Apr 2023 14:46:59 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.25 via Frontend Transport; Fri, 7 Apr 2023 14:46:59 +0800 From: Jason-JH.Lin To: Chun-Kuang Hu , AngeloGioacchino Del Regno Subject: [PATCH 2/5] drm/mediatek: Add cnt checking for coverity issue Date: Fri, 7 Apr 2023 14:46:54 +0800 Message-ID: <20230407064657.12350-3-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20230407064657.12350-1-jason-jh.lin@mediatek.com> References: <20230407064657.12350-1-jason-jh.lin@mediatek.com> MIME-Version: 1.0 X-MTK: N X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Jason-JH . Lin" , Singo Chang , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Project_Global_Chrome_Upstream_Group@mediatek.com, Rex-BC Chen , Jason-ch Chen , Nancy Lin , linux-mediatek@lists.infradead.org, Shawn Sung , Matthias Brugger , linux-arm-kernel@lists.infradead.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" CERT-C Characters and Strings (CERT STR31-C) all_drm_priv[cnt] evaluates to an address that could be at negative offset of an array. In mtk_drm_get_all_drm_priv(): Guarantee that storage for strings has sufficient space for character data and the null terminator. So change cnt to unsigned int and check its max value. Signed-off-by: Jason-JH.Lin Fixes: 1ef7ed48356c ("drm/mediatek: Modify mediatek-drm for mt8195 multi mmsys support") --- drivers/gpu/drm/mediatek/mtk_drm_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index 86255a066faf..fcfa10332166 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -378,7 +378,7 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev) const struct of_device_id *of_id; struct device_node *node; struct device *drm_dev; - int cnt = 0; + unsigned int cnt = 0; int i, j; for_each_child_of_node(phandle->parent, node) { @@ -397,7 +397,7 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev) continue; all_drm_priv[cnt] = dev_get_drvdata(drm_dev); - if (all_drm_priv[cnt] && all_drm_priv[cnt]->mtk_drm_bound) + if (cnt < MAX_CRTC && all_drm_priv[cnt] && all_drm_priv[cnt]->mtk_drm_bound) cnt++; }