[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 <k...@umn.edu>
Reviewed-by: Mukesh Ojha <mo...@codeaurora.org>
---
v2: pass error code upstream in the caller as suggested by
Mukesh Ojha <mo...@codeaurora.org>
---
 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