From: Lars-Peter Clausen <lars@metafoo.de>
Date: Thu, 1 Aug 2013 16:30:38 +0000 (+0200)
Subject: ASoC: dapm: Fix empty list check in dapm_new_mux()
X-Git-Tag: v3.11-rc6~9^2~1^2~2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe581391147cb3d738d961d0f1233d91a9e1113c;p=pandora-kernel.git

ASoC: dapm: Fix empty list check in dapm_new_mux()

list_first_entry() will always return a valid pointer, even if the list is
empty. So the check whether path is NULL will always be false. So we end up
calling dapm_create_or_share_mixmux_kcontrol() with a path struct that points
right in the middle of the widget struct and by trying to modify the path the
widgets memory will become corrupted. Fix this by using list_emtpy() to check if
the widget doesn't have any paths.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org
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