linux-kernel - Re: [PATCH 2/3] mailbox: Avoid NULL dereference in mbox_chan_received

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:   Thu, 1 Mar 2018 19:02:34 +0530
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ", linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, srv_heupstream" 
        <linux-arm-kernel@...ts.infradead.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH 2/3] mailbox: Avoid NULL dereference in mbox_chan_received_data

On Wed, Feb 28, 2018 at 7:57 AM, Samuel Holland <samuel@...lland.org> wrote:
> If a reception IRQ is pending when a mailbox channel is shut down (for
> example, if the controller uses threaded interrupts), it is possible for
> mbox_chan_received_data to be called while chan->cl is NULL.
>
We can add a check in mailbox.c, but that is like shoving it under the carpet.
How does your code look like?  mbox_chan_received_data() is meant to
be called from interrupt context as its documentation says.
Also the controller driver is responsible for ceasing any transient
xfer before returning from shutdown() callback.

Cheers!