linux-kernel - Re: [PATCH] kernel/irq/proc.c: set MAX_NAMELEN 11 instead of 10 which express the maximize size of "%d" or "%u".

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Message-ID: <CAFLxGvy0+9tu5PF2kKrUyVRobixtLaSs_u_b9zwFj64YvQrxgw@mail.gmail.com>
Date:	Sat, 5 Oct 2013 18:08:31 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Joe Perches <joe@...ches.com>, Al Viro <viro@...iv.linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/irq/proc.c: set MAX_NAMELEN 11 instead of 10 which
 express the maximize size of "%d" or "%u".

On Sat, Oct 5, 2013 at 5:46 PM, Chen Gang <gang.chen@...anux.com> wrote:
> On 10/05/2013 11:41 PM, Joe Perches wrote:
>> On Sat, 2013-10-05 at 23:19 +0800, Chen Gang wrote:
>>> Theoretically, the maximize size of "%d" or "%u" is 11 (10 + '\0'), so
>>> need set MAX_NAMELEN 11 instead of 10.
>>
>> %d can be negative.
>>
>>
>>
>>
>
> Oh, really, it is incorrect. Al Viro succeeds once.  :-(
>
> And I should send patch v2 for it.

irq is in both register_irq_proc() and unregister_irq_proc() an unsigned int.
Therefore %d makes not really sense. Both should use %u.
IMHO sprintf() should also get replaced by snprintf() but that's a
matter of taste.

-- 
Thanks,
//richard
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