[PATCH v2] sound: codecs: fix a potential NULL pointer dereference

[Kangjie Lu]

In case devm_kzalloc fails, the patch returns -ENOMEM to avoid
potential NULL pointer dereference.

Also add a check for rt5663_parse_dp to pass the error code
upstream

Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
Reviewed-by: Mukesh Ojha <mojha@xxxxxxxxxxxxxx>
---
v2: pass error code upstream in the caller as suggested by
Mukesh Ojha <mojha@xxxxxxxxxxxxxx>
---
 sound/soc/codecs/rt5663.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/rt5663.c b/sound/soc/codecs/rt5663.c
index da6647015708..ab03ba499ad2 100644
--- a/sound/soc/codecs/rt5663.c
+++ b/sound/soc/codecs/rt5663.c
@@ -3480,6 +3480,8 @@ static int rt5663_parse_dp(struct rt5663_priv *rt5663, struct device *dev)
 		table_size = sizeof(struct impedance_mapping_table) *
 			rt5663->pdata.impedance_sensing_num;
 		rt5663->imp_table = devm_kzalloc(dev, table_size, GFP_KERNEL);
+		if (!rt5663->imp_table)
+			return -ENOMEM;
 		device_property_read_u32_array(dev,
 			"realtek,impedance_sensing_table",
 			(u32 *)rt5663->imp_table, table_size);
@@ -3507,8 +3509,11 @@ static int rt5663_i2c_probe(struct i2c_client *i2c,
 
 	if (pdata)
 		rt5663->pdata = *pdata;
-	else
-		rt5663_parse_dp(rt5663, &i2c->dev);
+	else {
+		ret = rt5663_parse_dp(rt5663, &i2c->dev);
+		if (ret)
+			return ret;
+	}
 
 	for (i = 0; i < ARRAY_SIZE(rt5663->supplies); i++)
 		rt5663->supplies[i].supply = rt5663_supply_names[i];
-- 
2.17.1