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From:   Amit Pundir <amit.pundir@linaro.org>
Date:   Mon, 23 Apr 2018 22:51:35 +0530
Message-ID: <CAMi1Hd36LbWSTsnxiLY0CAgW_CaAbTJNRrUQ07Qb4OiSmuC5sw@mail.gmail.com>
Subject: Re: [RESEND][PATCH 2/4] NFC: st21nfca: Fix memory OOB and leak issues
 in connectivity events handler
To:     Mark Greer <mgreer@animalcreek.com>
Cc:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        lkml <linux-kernel@vger.kernel.org>,
        linux-wireless@vger.kernel.org,
        Samuel Ortiz <sameo@linux.intel.com>,
        Christophe Ricard <christophe.ricard@gmail.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        John Stultz <john.stultz@linaro.org>,
        Dmitry Shmidt <dimitrysh@google.com>,
        Todd Kjos <tkjos@google.com>,
        Android Kernel Team <kernel-team@android.com>,
        Suren Baghdasaryan <surenb@google.com>
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On 20 April 2018 at 22:15, Mark Greer <mgreer@animalcreek.com> wrote:
> On Fri, Apr 20, 2018 at 03:39:46PM +0300, Andy Shevchenko wrote:
>> On Wed, 2018-04-18 at 15:35 +0530, Amit Pundir wrote:
>>
>> >             if (skb->data[transaction->aid_len + 2] !=
>> > -               NFC_EVT_TRANSACTION_PARAMS_TAG)
>> > +               NFC_EVT_TRANSACTION_PARAMS_TAG ||
>> > +               skb->len < transaction->aid_len + transaction-
>> > >params_len + 4) {
>>
>> > +                   devm_kfree(dev, transaction);
>>
>> Oh, no.
>>
>> This is not memory leak per se, this is bad choice of devm_ API where it
>> should use plain kmalloc() / kfree().
>
> Also, there is no check to see if the allocation worked at all.

Ack. I'll add that in v2.
Thanks.

Regards,
Amit Pundir

>
> Mark
> --