From: Lars-Peter Clausen lars@metafoo.de
commit 90751fb9f224e0e1555b49a8aa9e68f6537e4cec upstream.
Registering a trigger can fail and the return value of devm_iio_trigger_register() must be checked. Otherwise undefined behavior can occur when the trigger is used.
Fixes: 7c0299e879dd ("iio: adc: Add support for DLN2 ADC") Signed-off-by: Lars-Peter Clausen lars@metafoo.de Link: https://lore.kernel.org/r/20211101133043.6974-1-lars@metafoo.de Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/dln2-adc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/iio/adc/dln2-adc.c +++ b/drivers/iio/adc/dln2-adc.c @@ -674,7 +674,11 @@ static int dln2_adc_probe(struct platfor } dln2->trig->ops = &dln2_adc_trigger_ops; iio_trigger_set_drvdata(dln2->trig, dln2); - devm_iio_trigger_register(dev, dln2->trig); + ret = devm_iio_trigger_register(dev, dln2->trig); + if (ret) { + dev_err(dev, "failed to register trigger: %d\n", ret); + return ret; + } iio_trigger_set_immutable(indio_dev, dln2->trig);
ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,