linux-kernel - Re: [PATCH] rapidio: fix rio_dma

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] [day] [month] [year] [list]

Date:   Fri, 13 Apr 2018 14:16:34 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Ioan Nicu <ioan.nicu.ext@...ia.com>
Cc:     Alexandre Bounine <alex.bou9@...il.com>,
        Barry Wood <barry.wood@....com>,
        Matt Porter <mporter@...nel.crashing.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Al Viro <viro@...iv.linux.org.uk>,
        Logan Gunthorpe <logang@...tatee.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Frank Kunz <frank.kunz@...ia.com>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rapidio: fix rio_dma_transfer error handling

On Fri, 13 Apr 2018 09:09:18 +0200 Ioan Nicu <ioan.nicu.ext@...ia.com> wrote:

> > > And please remember to always include all information regarding
> > > end-user impact when fixing bugs.
> > > 
> > This bug fix is applicable to versions starting from v4.6
> 
> Actually, this is something I broke with my previous patch where I added a
> kref to the mport_dma_req structure. Before this patch, all the error paths
> were doing kfree(req) instead of kref_put(&req->refcount, dma_req_free).
> 
> Now that dma_req_free() is called, it dereferences req->dmach, which is
> initialized late in do_dma_request(), so dma_req_free() could be called
> with a NULL req->dmach in some cases.
> 
> Sorry if I did not make this clear enough in the description.

I added

Fixes: bbd876adb8c72 ("rapidio: use a reference count for struct mport_dma_req")

(correct?) and removed cc:stable.