netdev - Re: [v3] net: ethernet: cavium: octeon: octeon_mgmt: Handle return NULL error from devm

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Message-Id: <20161219.110420.1570801461162159172.davem@davemloft.net>
Date:   Mon, 19 Dec 2016 11:04:20 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     arvind.yadav.cs@...il.com
Cc:     peter.chen@....com, fw@...len.de, david.daney@...ium.com,
        f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v3] net: ethernet: cavium: octeon: octeon_mgmt: Handle return
 NULL error from devm_ioremap

From: Arvind Yadav <arvind.yadav.cs@...il.com>
Date: Thu, 15 Dec 2016 00:33:30 +0530

> Here, If devm_ioremap will fail. It will return NULL.
> Kernel can run into a NULL-pointer dereference.
> This error check will avoid NULL pointer dereference.
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>

Since ioremap() is in fact designed to possibly fail, we do
need to always check it's return value.  So this change is
correct and I have applied it to the 'net' tree.

Thanks.