linux-kernel - Re: simple_strtoull()

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Message-ID: <4F5E8491.70403@gmail.com>
Date:	Tue, 13 Mar 2012 10:19:45 +1100
From:	Ryan Mallon <rmallon@...il.com>
To:	shuahkhan@...il.com
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: simple_strtoull() - FIXME?

On 13/03/12 03:16, Shuah Khan wrote:

> What's this FIXME in simple_strtoull() for? Something to be terribly
> concerned about and need fixing (assuming there is something that still
> needs fixing)
> 
> unsigned long long simple_strtoull(const char *cp, char **endp, unsigned
> int base)
> {
>         unsigned long long result;
>         unsigned int rv;
> 
>         cp = _parse_integer_fixup_radix(cp, &base);
>         rv = _parse_integer(cp, base, &result);
>         /* FIXME */

git blame/show answers your question. From the commit message of
1dff46d6: lib/kstrtox: common code between kstrto*() and simple_strto*()
functions:

 simple_strtoull() (and scanf(), BTW) ignores integer overflow, that's a
 bug we currently don't have guts to fix, making KSTRTOX_OVERFLOW hack
 necessary.

Note that simple_strtoull and friends are now deprecated (see
include/linux/kernel.h) and you should now be using the kstrto*
functions instead.

~Ryan

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