linux-kernel - Re: [PATCH] staging: rts5208: add check on NULL before dereference

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Message-ID: <CAHp75VdkDCCJCqBTGsPCzaCKfT_bqYNGDQekvr56U3fhR+uthA@mail.gmail.com>
Date:   Sat, 9 Jun 2018 22:34:43 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Gaurav Pathak <gauravpathak129@...il.com>,
        Hannes Reinecke <hare@...e.de>, devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH] staging: rts5208: add check on NULL before dereference

On Sat, Jun 9, 2018 at 7:58 PM,  <okaya@...eaurora.org> wrote:
> On 2018-06-09 12:38, Anton Vasilyev wrote:
>>
>> If rtsx_probe fails to allocate dev->chip, then NULL pointer
>> dereference occurs at rtsx_release_resources().
>>
>> Patch adds checks chip on NULL before its dereference at
>> rtsx_release_resources and passing with dereference inside
>> rtsx_release_chip.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).

> I think you should bail out if dev->chip is null rather than adding
> conditiinals.

I'm wondering if it's false positive. At which circumstances that may happen?

-- 
With Best Regards,
Andy Shevchenko