linux-kernel - Re: [PATCH] i2c: replace i2c_new_secondary_device with an ERR

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]

Message-ID: <20190809154103.GC5099@ninjato>
Date:   Fri, 9 Aug 2019 17:41:03 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org, Andrzej Hajda <a.hajda@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] i2c: replace i2c_new_secondary_device with an ERR_PTR
 variant

Hi Laurent,

> > > > +		if (IS_ERR(state->i2c_clients[i])) {
> > > > +			err = PTR_ERR(state->i2c_clients[i]);
> > > >  			v4l2_err(sd, "failed to create i2c client %u\n", i);
> > > >  			goto err_i2c;
> 
> This will call adv76xx_unregister_clients(), which will try to
> i2c_unregister_device() all non-NULL i2c_clients entries. You need to

Uh, right! Sorry for missing this :(

> either set the entry to NULL here, or update
> adv76xx_unregister_clients() to skip IS_ERR() entries. My preference
> would be to store the return value of adv76xx_dummy_client() in a local
> variable here, and set state->i2c_clients[i] after the error check.

I implemented your preference and simplified
adv76xx_unregister_clients() because i2c_unregister_device is NULL
pointer aware. New patch coming in a minute.

Thanks for the review,

   Wolfram


Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)