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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@ -679,13 +679,14 @@ static int dapm_new_mux(struct snd_soc_dapm_widget *w)
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return -EINVAL;
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}
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path = list_first_entry(&w->sources, struct snd_soc_dapm_path,
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list_sink);
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if (!path) {
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if (list_empty(&w->sources)) {
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dev_err(dapm->dev, "ASoC: mux %s has no paths\n", w->name);
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return -EINVAL;
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}
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path = list_first_entry(&w->sources, struct snd_soc_dapm_path,
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list_sink);
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ret = dapm_create_or_share_mixmux_kcontrol(w, 0, path);
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if (ret < 0)
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return ret;
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