From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/10] parse_integer: convert mm/
Date: Mon, 04 May 2015 16:33:12 +0200 [thread overview]
Message-ID: <878ud4if9z.fsf@rasmusvillemoes.dk> (raw)
In-Reply-To: <20150502005535.GF21655@p183.telecom.by> (Alexey Dobriyan's message of "Sat, 2 May 2015 03:55:35 +0300")
On Sat, May 02 2015, Alexey Dobriyan <adobriyan@gmail.com> wrote:
> Convert mm/ directory away from deprecated simple_strto*() interface.
>
> One thing to note about parse_integer() and seemingly useless casts --
> range of accepted values depends on result type.
>
> int val;
> parse_integer(s, 0, &val);
>
> will accept negative integers, while
>
> int val;
> parse_integer(s, 0, (unsigned int *)&val);
>
> will accept only 0 and positive integers.
... and then silently write a negative value to val if the parsed
integer happens to be larger than INT_MAX.
Again, I think passing cast expressions to parse_integer should be
verboten.
In these particular cases:
* memtest_pattern should just be unsigned int - it's only ever used as
such anyway, and it represents a count.
* hashdist should be a boolean, but even in its current form, there's no
reason to not just use parse_integer as-is. If people like to set it
by passing -42 just let them.
Rasmus
next prev parent reply other threads:[~2015-05-04 14:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-02 0:47 [PATCH 01/10] Add parse_integer() (replacement for simple_strto*()) Alexey Dobriyan
2015-05-02 0:48 ` [PATCH 02/10] parse_integer: rewrite kstrto*() Alexey Dobriyan
2015-05-02 0:50 ` [PATCH 03/10] parse_integer: convert sscanf() Alexey Dobriyan
2015-05-02 1:10 ` [PATCH CORRECT " Alexey Dobriyan
2015-05-02 0:51 ` [PATCH 04/10] sscanf: fix overflow Alexey Dobriyan
2015-05-05 9:51 ` Rasmus Villemoes
2015-05-05 11:10 ` Alexey Dobriyan
2015-05-06 7:49 ` Rasmus Villemoes
2015-05-02 0:53 ` [PATCH 05/10] parse_integer: convert lib/ Alexey Dobriyan
2015-05-04 14:10 ` Rasmus Villemoes
2015-05-04 14:57 ` Alexey Dobriyan
2015-05-02 0:55 ` [PATCH 06/10] parse_integer: convert mm/ Alexey Dobriyan
2015-05-04 14:33 ` Rasmus Villemoes [this message]
2015-05-04 15:09 ` Alexey Dobriyan
2015-05-02 0:56 ` [PATCH 07/10] parse_integer: convert misc fs/ code Alexey Dobriyan
2015-05-02 0:59 ` [PATCH 08/10] fs/cachefiles/: convert to parse_integer() Alexey Dobriyan
2015-05-02 1:01 ` [PATCH 09/10] ocfs2: convert to parse_integer()/kstrto*() Alexey Dobriyan
2015-05-02 1:03 ` [PATCH 10/10] ext2, ext3, ext4: " Alexey Dobriyan
2015-05-04 13:24 ` [PATCH 01/10] Add parse_integer() (replacement for simple_strto*()) Rasmus Villemoes
2015-05-04 14:32 ` Alexey Dobriyan
2015-05-04 16:44 ` Rasmus Villemoes
2015-05-04 19:54 ` Alexey Dobriyan
2015-05-04 21:48 ` Rasmus Villemoes
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