linux-kernel - Re: [PATCH v3] err.h: allow IS_ERR_VALUE to handle properly more types

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <56B363E3.9050007@samsung.com>
Date:	Thu, 04 Feb 2016 15:44:51 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	open list <linux-kernel@...r.kernel.org>,
	Bob Peterson <rpeterso@...hat.com>
Subject: Re: [PATCH v3] err.h: allow IS_ERR_VALUE to handle properly more types

On 02/04/2016 01:40 PM, Arnd Bergmann wrote:
> On Wednesday 03 February 2016 14:15:28 Andrzej Hajda wrote:
>> diff --git a/include/linux/err.h b/include/linux/err.h
>> index 56762ab..b7d4a9f 100644
>> --- a/include/linux/err.h
>> +++ b/include/linux/err.h
>> @@ -18,7 +18,9 @@
>>  
>>  #ifndef __ASSEMBLY__
>>  
>> -#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
>> +#define IS_ERR_VALUE(x) ((typeof(x))(-1) <= 0 \
>> +                               ? unlikely((x) <= -1) \
>> +                               : unlikely((x) >= (typeof(x))-MAX_ERRNO))
>>  
>>  static inline void * __must_check ERR_PTR(long error)
>>  {
>>
> This has caused a warning to reappear that I had fixed before:
>
> fs/gfs2/dir.c: In function 'get_first_leaf':
> fs/gfs2/dir.c:802:9: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized]
>    error = get_leaf(dip, leaf_no, bh_out);
>          ^
> fs/gfs2/dir.c: In function 'dir_split_leaf':
> fs/gfs2/dir.c:1021:8: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   error = get_leaf(dip, leaf_no, &obh);

What gcc/arch/build options do you use? I cannot reproduce it in my
environment.

Regards
Andrzej