linux-kernel - Re: [PATCH v2 1/9] lib: string_helpers: provide kfree

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: <20200929084912.GZ3956970@smile.fi.intel.com>
Date:   Tue, 29 Sep 2020 11:49:12 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Joe Perches' <joe@...ches.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Kent Gibson <warthog618@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 1/9] lib: string_helpers: provide kfree_strarray()

On Tue, Sep 29, 2020 at 08:10:10AM +0000, David Laight wrote:
> From: Joe Perches
> > Sent: 28 September 2020 17:07
> > 
> > On Mon, 2020-09-28 at 18:02 +0200, Bartosz Golaszewski wrote:
> > > On Mon, Sep 28, 2020 at 5:59 PM Joe Perches <joe@...ches.com> wrote:
> > > > On Mon, 2020-09-28 at 12:41 +0200, Bartosz Golaszewski wrote:
> > > > > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > > > >
> > > > > There's a common pattern of dynamically allocating an array of char
> > > > > pointers and then also dynamically allocating each string in this
> > > > > array. Provide a helper for freeing such a string array with one call.
> > > >
> > > > Isn't this also common for things like ring buffers?
> > > > Why limit this to char *[]?
> > > >
> > >
> > > I don't want to add APIs nobody is using. What do you suggest?
> > 
> > Change the argument to void** and call it
> > 
> > void kfree_array(void **array, int count);
> 
> Does help, void doesn't work that way.

Actually good catch. void * and void ** have a big difference in the implicit
casting behaviour. I was stumbled over this while playing with some
experimental stuff locally.

-- 
With Best Regards,
Andy Shevchenko