linux-kernel - Re: [PATCH v2] mtd: rawnand: atmel: Fix potential NULL pointer dereference

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Message-ID: <20180919232745.4ed2197c@xps13>
Date:   Wed, 19 Sep 2018 23:27:45 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: rawnand: atmel: Fix potential NULL pointer
 dereference

Hi Gustavo,

"Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote on Tue, 18 Sep
2018 08:55:55 -0500:

> There is a potential execution path in which function
> of_find_compatible_node() returns NULL. In such a case,
> we end up having a NULL pointer dereference when accessing
> pointer *nfc_np* in function of_clk_get().
> 
> So, we better don't take any chances and fix this by null
> checking pointer *nfc_np* before calling of_clk_get().
> 
> Addresses-Coverity-ID: 1473052 ("Dereference null return value")
> Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---

Applied to nand/next.

Thanks,
Miquèl