[PATCH] iio: hmc: fix a potential NULL pointer dereference

[Kangjie Lu]

devm_regmap_init_i2c may fail and return NULL. The fix returns
the error when it fails.

Signed-off-by: Kangjie Lu <k...@umn.edu>
---
 drivers/iio/magnetometer/hmc5843_i2c.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/magnetometer/hmc5843_i2c.c 
b/drivers/iio/magnetometer/hmc5843_i2c.c
index 3de7f4426ac4..c0cd0823f8d5 100644
--- a/drivers/iio/magnetometer/hmc5843_i2c.c
+++ b/drivers/iio/magnetometer/hmc5843_i2c.c
@@ -58,8 +58,13 @@ static const struct regmap_config hmc5843_i2c_regmap_config 
= {
 static int hmc5843_i2c_probe(struct i2c_client *cli,
                             const struct i2c_device_id *id)
 {
+       struct regmap *devm_regmap = devm_regmap_init_i2c(cli,
+                       &hmc5843_i2c_regmap_config);
+       if (IS_ERR(devm_regmap))
+               return PTR_ERR(devm_regmap);
+
        return hmc5843_common_probe(&cli->dev,
-                       devm_regmap_init_i2c(cli, &hmc5843_i2c_regmap_config),
+                       devm_regmap,
                        id->driver_data, id->name);
 }
 
-- 
2.17.1