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authorLars-Peter Clausen <lars@metafoo.de>2013-08-01 18:30:38 +0200
committerMark Brown <broonie@linaro.org>2013-08-01 19:25:16 +0100
commitfe581391147cb3d738d961d0f1233d91a9e1113c (patch)
treecadab7c9e8b6913e9373c6fa6ae35981385c8221
parent56a678344273fd63f8ade26876283a2586a9bf3a (diff)
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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
-rw-r--r--sound/soc/soc-dapm.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index bd16010..4375c9f 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -679,13 +679,14 @@ static int dapm_new_mux(struct snd_soc_dapm_widget *w)
return -EINVAL;
}
- path = list_first_entry(&w->sources, struct snd_soc_dapm_path,
- list_sink);
- if (!path) {
+ if (list_empty(&w->sources)) {
dev_err(dapm->dev, "ASoC: mux %s has no paths\n", w->name);
return -EINVAL;
}
+ path = list_first_entry(&w->sources, struct snd_soc_dapm_path,
+ list_sink);
+
ret = dapm_create_or_share_mixmux_kcontrol(w, 0, path);
if (ret < 0)
return ret;