linux-kernel - Re: [PATCH] HID: multitouch: prevent memleak with the allocated name

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]

Message-ID: <CAHp75VcpdQqd+evBNhwMGHvXwCoVdaXYdBqQeSDGwt25dLkpGQ@mail.gmail.com>
Date:	Wed, 29 May 2013 23:12:54 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] HID: multitouch: prevent memleak with the allocated name

On Wed, May 29, 2013 at 11:45 AM, Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
> mt_free_input_name() was never called during .remove():
> hid_hw_stop() removes the hid_input items in hdev->inputs, and so the
> list is therefore empty after the call. In the end, we never free the
> special names that has been allocated during .probe().
>
> Restore the original name before freeing it to avoid acessing already
> freed pointer.
>

> I just spotted this one yesterday... My guess is that this way is safe (without
> a locking mechanism to prevent accessing hi->input->name), but I'm not 100% sure.

Hi Jiri, Benjamin.

What do you think about patch I just sent?

P.S. Benjamin, I re-used your commit message, I think you have no objections.

--
With Best Regards,
Andy Shevchenko
--
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/