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Date:   Fri, 15 Jan 2021 10:22:50 +0800
From:   Qinglang Miao <miaoqinglang@...wei.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Hanjun Guo <guohanjun@...wei.com>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Qinglang Miao" <miaoqinglang@...wei.com>
Subject: [PATCH v2] ACPI: configfs: add missing check after configfs_register_default_group

A list_add corruption is reported by Hulk Robot like this:
==============
list_add corruption.
Call Trace:
link_obj+0xc0/0x1c0
link_group+0x21/0x140
configfs_register_subsystem+0xdb/0x380
acpi_configfs_init+0x25/0x1000 [acpi_configfs]
do_one_initcall+0x149/0x820
do_init_module+0x1ef/0x720
load_module+0x35c8/0x4380
__do_sys_finit_module+0x10d/0x1a0
do_syscall_64+0x34/0x80

It's because of the missing check after configfs_register_default_group,
where configfs_unregister_subsystem should be called once failure.

Fixes: 612bd01fc6e0 ("ACPI: add support for loading SSDTs via configfs")
Reported-by: Hulk Robot <hulkci@...wei.com>
Suggested-by: Hanjun Guo <guohanjun@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
---
v1->v2: fix 'register' to 'unregister' which is typo.

 drivers/acpi/acpi_configfs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c
index cf91f4910..3a14859db 100644
--- a/drivers/acpi/acpi_configfs.c
+++ b/drivers/acpi/acpi_configfs.c
@@ -268,7 +268,12 @@ static int __init acpi_configfs_init(void)
 
 	acpi_table_group = configfs_register_default_group(root, "table",
 							   &acpi_tables_type);
-	return PTR_ERR_OR_ZERO(acpi_table_group);
+	if (IS_ERR(acpi_table_group)) {
+		configfs_unregister_subsystem(&acpi_configfs);
+		return PTR_ERR(acpi_table_group);
+	}
+
+	return 0;
 }
 module_init(acpi_configfs_init);
 
-- 
2.23.0

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