linux-kernel - Re: [PATCH] NFS4: Avoid potential NULL pointer dereference in decode_and_add

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Message-ID: <AANLkTimFfyT4M=0=mxfF4ZZjip2wbO27p_zUJg26TO2q@mail.gmail.com>
Date:	Mon, 17 Jan 2011 14:09:31 -0500
From:	Fred Isaman <iisaman@...app.com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-nfs@...r.kernel.org,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFS4: Avoid potential NULL pointer dereference in decode_and_add_ds().

On Mon, Jan 17, 2011 at 1:42 PM, Jesper Juhl <jj@...osbits.net> wrote:
> On Mon, 17 Jan 2011, Fred Isaman wrote:
>
>> On Sun, Jan 16, 2011 at 3:50 PM, Jesper Juhl <jj@...osbits.net> wrote:
>> > strrchr() can return NULL if nothing is found. If this happens we'll
>> > dereference a NULL pointer in
>> > fs/nfs/nfs4filelayoutdev.c::decode_and_add_ds().
>> >
>> > I tried to find some other code that guarantees that this can never
>> > happen but I was unsuccessful. So, unless someone else can point to some
>> > code that ensures this can never be a problem, I believe this patch is
>> > needed.
>> >
>>
>> The only guarantee is the assumption that the server isn't sending
>> garbage.  As such, this patch looks good to me.
>>
>
> Thanks. Can I add your Acked-by: if/when I resend the patch?
>

Yes.

Fred

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