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ACPI: configfs: add missing check after configfs_register_default_group() 

commit 67e40054de86aae520ddc2a072d7f6951812a14f upstream.

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: 612bd01fc6 ("ACPI: add support for loading SSDTs via configfs")
Reported-by: Hulk Robot <hulkci@huawei.com>
Suggested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Cc: 4.10+ <stable@vger.kernel.org> # 4.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qinglang Miao 2021-01-15 10:22:50 +08:00 committed by Greg Kroah-Hartman
parent 40b70c98be
commit e690b3f486
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/acpi/acpi_configfs.c
View File

@ -267,7 +267,12 @@ 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);