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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 Subject: [PATCH v2 5/6] dt-overlay: Ignore nodes that do not have __overlay__ as their subnode Date: Fri, 4 Oct 2024 14:22:19 +0200 Message-ID: <20241004122220.234817-6-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241004122220.234817-1-michal.orzel@amd.com> References: <20241004122220.234817-1-michal.orzel@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001F2:EE_|MN0PR12MB5713:EE_ X-MS-Office365-Filtering-Correlation-Id: d50d2992-d97a-4037-6573-08dce46f3ba9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700013|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Oct 2024 12:22:37.1821 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d50d2992-d97a-4037-6573-08dce46f3ba9 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: SJ5PEPF000001F2.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB5713 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1728044598005116600 Content-Type: text/plain; charset="utf-8" Assumption stated in the comments as if fdt_for_each_subnode() checks for parent < 0 is utterly wrong. If parent is < 0, node offset is set to 0 (i.e. the very first node in the tree) and the loop's body is executed. This incorrect assumption causes overlay_node_count() to also count nodes that do not have __overlay__ as their subnode. The same story goes for overlay_get_nodes_info(), where we end up requiring each node directly under root node to have "target-path" set. DTBOs can specify other nodes including special ones like __symbols__, __fixups__ that can be left to reduce the number of steps a user needs to do to when it comes to invalid phandles. Fix it by adding checks if overlay < 0 after respective calls to fdt_subnode_offset(). Signed-off-by: Michal Orzel Reviewed-by: Stefano Stabellini --- Changes in v2: - New patch --- xen/common/dt-overlay.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/xen/common/dt-overlay.c b/xen/common/dt-overlay.c index bfa153250922..4d75b5b36a99 100644 --- a/xen/common/dt-overlay.c +++ b/xen/common/dt-overlay.c @@ -274,11 +274,9 @@ static unsigned int overlay_node_count(const void *ove= rlay_fdt) int overlay; =20 overlay =3D fdt_subnode_offset(overlay_fdt, fragment, "__overlay__= "); + if ( overlay < 0 ) + continue; =20 - /* - * overlay value can be < 0. But fdt_for_each_subnode() loop check= s for - * overlay >=3D 0. So, no need for a overlay>=3D0 check here. - */ fdt_for_each_subnode(subnode, overlay_fdt, overlay) { num_overlay_nodes++; @@ -305,6 +303,10 @@ static int overlay_get_nodes_info(const void *fdto, ch= ar **nodes_full_path) int subnode; const char *target_path; =20 + overlay =3D fdt_subnode_offset(fdto, fragment, "__overlay__"); + if ( overlay < 0 ) + continue; + target =3D fdt_overlay_target_offset(device_tree_flattened, fdto, fragment, &target_path); if ( target < 0 ) @@ -313,12 +315,6 @@ static int overlay_get_nodes_info(const void *fdto, ch= ar **nodes_full_path) if ( target_path =3D=3D NULL ) return -EINVAL; =20 - overlay =3D fdt_subnode_offset(fdto, fragment, "__overlay__"); - - /* - * overlay value can be < 0. But fdt_for_each_subnode() loop check= s for - * overlay >=3D 0. So, no need for a overlay>=3D0 check here. - */ fdt_for_each_subnode(subnode, fdto, overlay) { const char *node_name =3D NULL; --=20 2.25.1