From: Martin Fuzzey <mfuzzey@parkeon.com>
Date: Thu, 19 Feb 2015 14:17:44 +0000 (+0100)
Subject: iio: core: Fix double free.
X-Git-Tag: v3.2.69~81
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=073bfbba54f94f1a9d3f20d5e07d830efe8f8f3a;p=pandora-kernel.git

iio: core: Fix double free.

commit c1b03ab5e886760bdd38c9c7a27af149046ffe01 upstream.

When an error occurred during event registration memory was freed twice
resulting in kernel memory corruption and a crash in unrelated code.

The problem was caused by
	iio_device_unregister_eventset()
	iio_device_unregister_sysfs()

being called twice, once on the error path and then
again via iio_dev_release().

Fix this by making these two functions idempotent so they
may be called multiple times.

The problem was observed before applying
	78b33216 iio:core: Handle error when mask type is not separate

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
[bwh: Backported to 3.2:
 - Adjust filenames, context
 - Drop inapplicable change to iio_free_chan_devattr_list()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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