linux-kernel - Re: [PATCH] libnvdimm: fix NULL pointer dereference

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Message-ID: <20180724194629.GA13685@localhost.localdomain>
Date:   Tue, 24 Jul 2018 13:46:29 -0600
From:   Keith Busch <keith.busch@...el.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libnvdimm: fix NULL pointer dereference

On Tue, Jul 24, 2018 at 08:40:06AM -0500, Gustavo A. R. Silva wrote:
> ndd is being dereferenced before it is null checked, hence there is a
> potential null pointer dereference.
> 
> Fix this by moving the pointer dereference after ndd has been properly
> null checked at line 554: if (!ndd)

I'll fold this into v4 of the patch since Vishal found an issue when a
DIMM has multiple regions.