linux-kernel - Re: [PATCH] ACPI: APEI: ERST: Fix missing error code in erst

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Message-ID: <87fsy0aj59.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Wed, 02 Jun 2021 14:13:38 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, anton@...msg.org,
        ccross@...roid.com, tony.luck@...el.com, james.morse@....com,
        bp@...en8.de, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] ACPI: APEI: ERST: Fix missing error code in erst_init()

Kees Cook <keescook@...omium.org> writes:

> On Tue, Jun 01, 2021 at 07:05:53PM +0800, Jiapeng Chong wrote:
>> The error code is missing in this code scenario, add the error code
>> '-EINVAL' to the return value 'rc'.
>> 
>> Eliminate the follow smatch warning:
>> 
>> drivers/acpi/apei/erst.c:1114 erst_init() warn: missing error code 'rc'.
>> 
>> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
>> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
>
> Is this a bug? I can't tell if this is meant to be a "silent" failure,
> like with acpi_disabled, erst_disabled, etc.
>
> If it _is_ a bug, then please include:
>
> Fixes: a08f82d08053 ("ACPI, APEI, Error Record Serialization Table (ERST) support")
>
> -Kees
>
>> ---
>>  drivers/acpi/apei/erst.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
>> index 242f3c2..492d499 100644
>> --- a/drivers/acpi/apei/erst.c
>> +++ b/drivers/acpi/apei/erst.c
>> @@ -1110,9 +1110,10 @@ static int __init erst_init(void)
>>  
>>  	status = acpi_get_table(ACPI_SIG_ERST, 0,
>>  				(struct acpi_table_header **)&erst_tab);
>> -	if (status == AE_NOT_FOUND)
>> +	if (status == AE_NOT_FOUND) {
>> +		rc = -EINVAL;

I don't think this is necessary.  It isn't an error not to have ERST
table in a machine.

Best Regards,
Huang, Ying

>>  		goto err;
>> -	else if (ACPI_FAILURE(status)) {
>> +	} else if (ACPI_FAILURE(status)) {
>>  		const char *msg = acpi_format_exception(status);
>>  		pr_err("Failed to get table, %s\n", msg);
>>  		rc = -EINVAL;
>> -- 
>> 1.8.3.1
>>