[PATCH 5/7] ASoC: rt7*-sdw: harden jack_detect_handler

[Pierre-Louis Bossart]

Realtek headset codec drivers typically check if the card is
instantiated before proceeding with the jack detection.

The rt700, rt711 and rt711-sdca are however missing a check on the
card pointer, which can lead to NULL dereferences encountered in
driver bind/unbind tests.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Rander Wang <rander.wang at intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao at linux.intel.com>
---
 sound/soc/codecs/rt700.c      | 2 +-
 sound/soc/codecs/rt711-sdca.c | 2 +-
 sound/soc/codecs/rt711.c      | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/rt700.c b/sound/soc/codecs/rt700.c
index af32295fa9b93..4a99d5f4706fd 100644
--- a/sound/soc/codecs/rt700.c
+++ b/sound/soc/codecs/rt700.c
@@ -162,7 +162,7 @@ static void rt700_jack_detect_handler(struct work_struct *work)
 	if (!rt700->hs_jack)
 		return;
 
-	if (!rt700->component->card->instantiated)
+	if (!rt700->component->card || !rt700->component->card->instantiated)
 		return;
 
 	reg = RT700_VERB_GET_PIN_SENSE | RT700_HP_OUT;
diff --git a/sound/soc/codecs/rt711-sdca.c b/sound/soc/codecs/rt711-sdca.c
index af73bcb4560a3..93b36f05cb567 100644
--- a/sound/soc/codecs/rt711-sdca.c
+++ b/sound/soc/codecs/rt711-sdca.c
@@ -294,7 +294,7 @@ static void rt711_sdca_jack_detect_handler(struct work_struct *work)
 	if (!rt711->hs_jack)
 		return;
 
-	if (!rt711->component->card->instantiated)
+	if (!rt711->component->card || !rt711->component->card->instantiated)
 		return;
 
 	/* SDW_SCP_SDCA_INT_SDCA_0 is used for jack detection */
diff --git a/sound/soc/codecs/rt711.c b/sound/soc/codecs/rt711.c
index 1e35ba433a7e7..2f445b27305a4 100644
--- a/sound/soc/codecs/rt711.c
+++ b/sound/soc/codecs/rt711.c
@@ -242,7 +242,7 @@ static void rt711_jack_detect_handler(struct work_struct *work)
 	if (!rt711->hs_jack)
 		return;
 
-	if (!rt711->component->card->instantiated)
+	if (!rt711->component->card || !rt711->component->card->instantiated)
 		return;
 
 	if (pm_runtime_status_suspended(rt711->slave->dev.parent)) {
-- 
2.34.1