linux-kernel - Re: [PATCH] ACPI: configfs: add missing check after configfs_register_default

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Date:   Wed, 13 Jan 2021 16:32:11 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Qinglang Miao <miaoqinglang@...wei.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI: configfs: add missing check after
 configfs_register_default_group

On 2021/1/13 15:30, Qinglang Miao wrote:
> 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.

I think it's right to call *_unregister_* for error path, but...

> 
> Fixes: 612bd01fc6e0 ("ACPI: add support for loading SSDTs via configfs")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
> ---
>   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..25512ab0e 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_register_subsystem(&acpi_configfs);

...

Typo here, s/register/unregister.

Thanks
Hanjun