[PATCH 4.19 34/70] ASoC: rt5640: Fix NULL dereference on module unload

[Greg Kroah-Hartman]

From: Dmitry Osipenko <digetx@xxxxxxxxx>

[ Upstream commit 89b71b3f02d8ae5a08a1dd6f4a2098b7b868d498 ]

The rt5640->jack is NULL if jack is already disabled at the time of
driver's module unloading.

Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
Link: https://lore.kernel.org/r/20200106014707.11378-1-digetx@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/soc/codecs/rt5640.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index 27770143ae8f2..974e1a4491723 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -2435,6 +2435,13 @@ static void rt5640_disable_jack_detect(struct snd_soc_component *component)
 {
 	struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
 
+	/*
+	 * soc_remove_component() force-disables jack and thus rt5640->jack
+	 * could be NULL at the time of driver's module unloading.
+	 */
+	if (!rt5640->jack)
+		return;
+
 	disable_irq(rt5640->irq);
 	rt5640_cancel_work(rt5640);
 
-- 
2.20.1