iio: adc: fix a potential NULL pointer dereference

devm_iio_trigger_alloc may fail and return NULL. The fix returns
ENOMEM when it fails.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/mxs-lradc-adc.c b/drivers/iio/adc/mxs-lradc-adc.c
index c627513..5384472 100644 (file)
--- a/drivers/iio/adc/mxs-lradc-adc.c
+++ b/drivers/iio/adc/mxs-lradc-adc.c
@@ -465,6 +465,8 @@ static int mxs_lradc_adc_trigger_init(struct iio_dev *iio)
 
        trig = devm_iio_trigger_alloc(&iio->dev, "%s-dev%i", iio->name,
                                      iio->id);
+       if (!trig)
+               return -ENOMEM;
 
        trig->dev.parent = adc->dev;
        iio_trigger_set_drvdata(trig, iio);