From nobody Sun Sep 22 02:30:32 2024 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 325FCC433EF for ; Thu, 16 Jun 2022 05:43:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358892AbiFPFnH (ORCPT ); Thu, 16 Jun 2022 01:43:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358773AbiFPFnB (ORCPT ); Thu, 16 Jun 2022 01:43:01 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D723D23BC9 for ; Wed, 15 Jun 2022 22:42:53 -0700 (PDT) X-UUID: 493f49af156b4ffe967889ef36a8e62d-20220616 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.6,REQID:5da808ff-2bed-4d51-b99a-ba429be8e024,OB:0,LO B:0,IP:0,URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACT ION:release,TS:-5 X-CID-META: VersionHash:b14ad71,CLOUDID:a5e2b248-4c92-421c-ad91-b806c0f58b2a,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: 493f49af156b4ffe967889ef36a8e62d-20220616 Received: from mtkmbs10n2.mediatek.inc [(172.21.101.183)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 78197603; Thu, 16 Jun 2022 13:42:48 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.3; Thu, 16 Jun 2022 13:42:47 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 16 Jun 2022 13:42:45 +0800 From: Yong Wu To: Joerg Roedel , Matthias Brugger , Will Deacon CC: , , , , "Yong Wu" , AngeloGioacchino Del Regno , , , , , , , , Guenter Roeck , "Dan Carpenter" Subject: [PATCH v2 3/5] iommu/mediatek: Validate number of phandles associated with "mediatek, larbs" Date: Thu, 16 Jun 2022 13:42:01 +0800 Message-ID: <20220616054203.11365-4-yong.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220616054203.11365-1-yong.wu@mediatek.com> References: <20220616054203.11365-1-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Guenter Roeck Fix the smatch warnings: drivers/iommu/mtk_iommu.c:878 mtk_iommu_mm_dts_parse() error: uninitialized symbol 'larbnode'. If someone abuse the dtsi node(Don't follow the definition of dt-binding), for example "mediatek,larbs" is provided as boolean property, "larb_nr" will be zero and cause abnormal. To fix this problem and improve the code safety, add some checking for the invalid input from dtsi, e.g. checking the larb_nr/larbid valid range, and avoid "mediatek,larb-id" property conflicts in the smi-larb nodes. Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with the MM TYP= E") Reported-by: kernel test robot Reported-by: Dan Carpenter Signed-off-by: Guenter Roeck Signed-off-by: Yong Wu Reviewed-by: AngeloGioacchino Del Regno --- drivers/iommu/mtk_iommu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index ab24078938bf..a869d4aee7b3 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1052,6 +1052,8 @@ static int mtk_iommu_mm_dts_parse(struct device *dev,= struct component_match **m larb_nr =3D of_count_phandle_with_args(dev->of_node, "mediatek,larbs", NU= LL); if (larb_nr < 0) return larb_nr; + if (larb_nr =3D=3D 0 || larb_nr > MTK_LARB_NR_MAX) + return -EINVAL; =20 for (i =3D 0; i < larb_nr; i++) { u32 id; @@ -1068,6 +1070,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev= , struct component_match **m ret =3D of_property_read_u32(larbnode, "mediatek,larb-id", &id); if (ret)/* The id is consecutive if there is no this property */ id =3D i; + if (id >=3D MTK_LARB_NR_MAX) { + ret =3D -EINVAL; + goto err_larbnode_put; + } =20 plarbdev =3D of_find_device_by_node(larbnode); if (!plarbdev) { @@ -1078,6 +1084,11 @@ static int mtk_iommu_mm_dts_parse(struct device *dev= , struct component_match **m ret =3D -EPROBE_DEFER; goto err_larbnode_put; } + + if (data->larb_imu[id].dev) { + ret =3D -EEXIST; + goto err_larbnode_put; + } data->larb_imu[id].dev =3D &plarbdev->dev; =20 component_match_add_release(dev, match, component_release_of, --=20 2.18.0