[PATCH] ASoC: codecs: pcm512x: fix null-ptr dereference in pcm512x_overclock_xxx_put()

[Jeongjun Park]

In the pcm512x chipset driver, pcm512x_overclock_xxx_put() is defined as
a general mixer kcontrol instead of a DAPM kcontrol, so struct
snd_soc_dapm_context must not be accessed via
snd_soc_dapm_kcontrol_to_dapm().

This causes a NULL pointer dereference, so it must be modified to use
snd_soc_component_to_dapm().

Cc: stable@xxxxxxxxxx
Closes: https://github.com/raspberrypi/linux/issues/7242
Fixes: 02dbbb7e982a ("ASoC: codecs: pcm512x: convert to snd_soc_dapm_xxx()")
Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>
---
 sound/soc/codecs/pcm512x.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/pcm512x.c b/sound/soc/codecs/pcm512x.c
index d4c1d8d45af3..348752722bd6 100644
--- a/sound/soc/codecs/pcm512x.c
+++ b/sound/soc/codecs/pcm512x.c
@@ -235,7 +235,7 @@ static int pcm512x_overclock_pll_put(struct snd_kcontrol *kcontrol,
 				     struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
-	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_to_dapm(kcontrol);
+	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
 	struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
 
 	switch (snd_soc_dapm_get_bias_level(dapm)) {
@@ -264,7 +264,7 @@ static int pcm512x_overclock_dsp_put(struct snd_kcontrol *kcontrol,
 				     struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
-	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_to_dapm(kcontrol);
+	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
 	struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
 
 	switch (snd_soc_dapm_get_bias_level(dapm)) {
@@ -293,7 +293,7 @@ static int pcm512x_overclock_dac_put(struct snd_kcontrol *kcontrol,
 				     struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
-	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_to_dapm(kcontrol);
+	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
 	struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
 
 	switch (snd_soc_dapm_get_bias_level(dapm)) {
--