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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

> --
> Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please.
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/