linux-kernel - Re: [RESEND][PATCH 2/4] NFC: st21nfca: Fix memory OOB and leak issues in connectivity events handler

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Date:   Fri, 20 Apr 2018 15:39:46 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Amit Pundir <amit.pundir@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-wireless@...r.kernel.org
Cc:     Samuel Ortiz <sameo@...ux.intel.com>,
        Christophe Ricard <christophe.ricard@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Dmitry Shmidt <dimitrysh@...gle.com>,
        Todd Kjos <tkjos@...gle.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [RESEND][PATCH 2/4] NFC: st21nfca: Fix memory OOB and leak
 issues in connectivity events handler

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().

>  			return -EPROTO;
> +		}

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy