linux-kernel - Re: [PATCH] drivers: staging: lustre: replace variable length array by dynamic allocation

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Message-ID: <CAHp75Ve4qDiuGsiy_7XiCvqrAG89R0xt6M_QH2HPKqiYjQ0YbQ@mail.gmail.com>
Date:   Sat, 27 May 2017 21:23:54 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Raphaël Beamonte <raphael.beamonte@...il.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        devel@...verdev.osuosl.org,
        Sebastien Buisson <sebastien.buisson@...l.net>,
        Hongchao Zhang <hongchao.zhang@...el.com>,
        Fan Yong <fan.yong@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Aditya Pandit <panditadityashreesh@...oo.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        "John L. Hammond" <john.hammond@...el.com>,
        lustre-devel@...ts.lustre.org
Subject: Re: [PATCH] drivers: staging: lustre: replace variable length array
 by dynamic allocation

On Tue, May 23, 2017 at 10:38 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Tue, May 23, 2017 at 09:32:13PM +0200, Raphaël Beamonte wrote:

>> drivers/staging/lustre/lustre/llite/xattr.c:89:62: warning: Variable
>> length array is used.
>> drivers/staging/lustre/lustre/llite/xattr.c:366:62: warning: Variable
>> length array is used.

>> +     fullname = kmalloc(strlen(handler->prefix) + strlen(name) + 1,
>> +                        GFP_KERNEL);
>> +     if (!fullname)
>> +             return -ENOMEM;
>> +
>>       sprintf(fullname, "%s%s\n", handler->prefix, name);
>>       rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
>>                        valid, fullname, pv, size, 0, flags,
>>                        ll_i2suppgid(inode), &req);
>> +
>> +     kfree(fullname);
>
> Didn't we reject much this same patch last week?

...besides the fact that kasprintf(); might be better in cases when
malloc + snprintf is used.

-- 
With Best Regards,
Andy Shevchenko