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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C From: Michal Orzel To: CC: Michal Orzel , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk Subject: [PATCH] xen/arm: bootfdt: Check return code of device_tree_for_each_node() Date: Thu, 7 Dec 2023 11:14:32 +0100 Message-ID: <20231207101432.37732-1-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A107:EE_|IA1PR12MB6212:EE_ X-MS-Office365-Filtering-Correlation-Id: 40107dc5-9c37-488e-e1dd-08dbf70d52f9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(346002)(136003)(376002)(396003)(39860400002)(230922051799003)(186009)(1800799012)(82310400011)(64100799003)(451199024)(46966006)(36840700001)(40470700004)(81166007)(47076005)(356005)(40480700001)(336012)(83380400001)(426003)(36860700001)(1076003)(2616005)(41300700001)(6666004)(26005)(6916009)(54906003)(316002)(478600001)(70586007)(70206006)(82740400003)(86362001)(44832011)(40460700003)(5660300002)(2906002)(4326008)(8936002)(8676002)(36756003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2023 10:14:40.1331 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 40107dc5-9c37-488e-e1dd-08dbf70d52f9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A107.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6212 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1701944111965100001 Content-Type: text/plain; charset="utf-8" As a result of not checking the return code of device_tree_for_each_node() in boot_fdt_info(), any error occured during early FDT parsing does not stop Xen from booting. This can result in an unwanted behavior in later boot stages. Fix it by checking the return code and panicing on an error. Fixes: 9cf4a9a46717 ("device tree: add device_tree_for_each_node()") Signed-off-by: Michal Orzel Acked-by: Julien Grall --- I've lost count how many times I had to fix missing rc check. However, I ha= ve not yet found any checker for this (-Wunused-result is pretty useless). --- xen/arch/arm/bootfdt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c index b1f03eb2fcdd..f496a8cf9494 100644 --- a/xen/arch/arm/bootfdt.c +++ b/xen/arch/arm/bootfdt.c @@ -541,7 +541,9 @@ size_t __init boot_fdt_info(const void *fdt, paddr_t pa= ddr) =20 add_boot_module(BOOTMOD_FDT, paddr, fdt_totalsize(fdt), false); =20 - device_tree_for_each_node((void *)fdt, 0, early_scan_node, NULL); + ret =3D device_tree_for_each_node((void *)fdt, 0, early_scan_node, NUL= L); + if ( ret ) + panic("Early FDT parsing failed (%d)\n", ret); =20 /* * On Arm64 setup_directmap_mappings() expects to be called with the l= owest --=20 2.25.1