netdev - Re: [PATCH net 2/3] sctp: return back transport in __sctp_rcv_init

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Message-ID: <20161028213943.GA14175@localhost.localdomain>
Date:   Fri, 28 Oct 2016 19:39:43 -0200
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        davem@...emloft.net, Vlad Yasevich <vyasevich@...il.com>,
        daniel@...earbox.net
Subject: Re: [PATCH net 2/3] sctp: return back transport in
 __sctp_rcv_init_lookup

On Fri, Oct 28, 2016 at 05:42:21PM -0200, Marcelo Ricardo Leitner wrote:
> On Fri, Oct 28, 2016 at 06:10:53PM +0800, Xin Long wrote:
> > Prior to this patch, it used a local variable to save the transport that is
> > looked up by __sctp_lookup_association(), and didn't return it back. But in
> > sctp_rcv, it is used to initialize chunk->transport. So when hitting this
> > code, it was initializing chunk->transport with some random stack value
> > instead.
> > 
> > This patch is to return the transport back through transport pointer
> > that is from __sctp_rcv_lookup_harder().
> > 
> > Signed-off-by: Xin Long <lucien.xin@...il.com>
> 
> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> 
> transport pointer in sctp_rcv() is initialized to null and there are
> checks for it after this path, so this shouldn't be exploitable, just
> malfunction.

This actually sort of contradicts the changelog.

Xin, did I miss something here? Seems we need to update the changelog if
not.