linux-kernel - Re: [PATCH] x86/mce: Check misc

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Message-ID: <535A4CBF.1090301@free.fr>
Date:	Fri, 25 Apr 2014 13:53:35 +0200
From:	mathieu souchaud <mattieu.souchaud@...e.fr>
To:	Borislav Petkov <bp@...en8.de>
CC:	tony.luck@...el.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] x86/mce: Check misc_register() return code.

Great,

I will fix that soon.

Thanks.

Le 25/04/2014 12:42, Borislav Petkov a écrit :
> On Fri, Apr 25, 2014 at 11:48:15AM +0200, Mathieu Souchaud wrote:
>> The current code does not check the return from misc_register() so set
>> the return variable with the return code of misc_register.
>>
>> Signed-off-by: Mathieu Souchaud <mattieu.souchaud@...e.fr>
>> ---
>>   arch/x86/kernel/cpu/mcheck/mce.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
>> index 68317c8..45fb7aa 100644
>> --- a/arch/x86/kernel/cpu/mcheck/mce.c
>> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
>> @@ -2462,7 +2462,7 @@ static __init int mcheck_init_device(void)
>>   	cpu_notifier_register_done();
>>   
>>   	/* register character device /dev/mcelog */
>> -	misc_register(&mce_chrdev_device);
>> +	err = misc_register(&mce_chrdev_device);
> This function mcheck_init_device() is a one big sloppy mess
> of not handling the error cases responsibly. It doesn't check
> zalloc_cpumask_var() retval, it doesn't free the mce_device_initialized
> when subsys_system_register() fails, the same when mce_device_create
> fails, the same with __register_hotcpu_notifier and finally with
> misc_register.
>
> Would you be willing to fix this properly with goto labels and proper
> unwinding, like it is done in other, saner places in the kernel, and
> at the end maybe add a printk for the error case warning us that
> /dev/mcelog didn't get registered?
>
> That would be a very nice cleanup! :-)
>
> Thanks.

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