linux-kernel - Re: Top kernel oopses/warnings this week

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Message-ID: <12c511ca0712171526h242a7de8vadec78cd48747bd@mail.gmail.com>
Date:	Mon, 17 Dec 2007 15:26:46 -0800
From:	"Tony Luck" <tony.luck@...el.com>
To:	"Arjan van de Ven" <arjan@...ux.intel.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	protasnb@...il.com, tytso@...nk.org
Subject: Re: Top kernel oopses/warnings this week

On Dec 17, 2007 3:17 PM, Arjan van de Ven <arjan@...ux.intel.com> wrote:
>
> Tony Luck wrote:
> >> +       static char target[80];
> >  ...
> >> +               sprintf(target, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
> >> +                       "%02x%02x%02x%02x%02x%02x",
> >
> > [80] is overkill ... [37] bytes should be enough (unless I went
> > cross-eyed counting the "%02x" :-)
> >
>
> %02x doesn't guarantee that it's at most 2, but at LEAST 2...

How will you fit a number that requires >2 hex digits into an
"unsigned char"?

Alternatively ... if %02x may spew more that 2 characters, can
you be sure that [80] is enough?

-Tony
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