ASoC: Remove DAPM debugfs entries before freeing widgets

Remove the DAPM debugfs entries before freeing the context's widgets, otherwise a
use after free situation might occur.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 8454cc2967d69f260271443df79607cecb1edbea..169e1767ebd05b2dd64e9be5d02b323c7e702d60 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1292,6 +1292,11 @@ static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
                        w->name);
 }
 
+static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
+{
+       debugfs_remove_recursive(dapm->debugfs_dapm);
+}
+
 #else
 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
        struct dentry *parent)
@@ -1302,6 +1307,10 @@ static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
 {
 }
 
+static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
+{
+}
+
 #endif
 
 /* test and update the power status of a mux widget */
@@ -2445,6 +2454,7 @@ EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
 void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
 {
        snd_soc_dapm_sys_remove(dapm->dev);
+       dapm_debugfs_cleanup(dapm);
        dapm_free_widgets(dapm);
        list_del(&dapm->list);
 }