From: Andy Shevchenko andy.shevchenko@gmail.com

device_for_each_child_node() bumps a reference counting of a returned variable. We have to balance it whenever we return to the caller.

Fixes: cbbb819837f6 ("iio: dac: ad5770r: Add AD5770R support") Cc: Alexandru Tachici alexandru.tachici@analog.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com Reviewed-by: Alexandru Ardelean ardeleanalex@gmail.com Link: https://lore.kernel.org/r/20210510095649.3302835-1-andy.shevchenko@gmail.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: WangXurun 1362675508@qq.com --- drivers/iio/dac/ad5770r.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/dac/ad5770r.c b/drivers/iio/dac/ad5770r.c index 84dcf149261f..42decba1463c 100644 --- a/drivers/iio/dac/ad5770r.c +++ b/drivers/iio/dac/ad5770r.c @@ -524,23 +524,29 @@ static int ad5770r_channel_config(struct ad5770r_state *st) device_for_each_child_node(&st->spi->dev, child) { ret = fwnode_property_read_u32(child, "num", &num); if (ret) - return ret; - if (num >= AD5770R_MAX_CHANNELS) - return -EINVAL; + goto err_child_out; + if (num >= AD5770R_MAX_CHANNELS) { + ret = -EINVAL; + goto err_child_out; + }

ret = fwnode_property_read_u32_array(child, "adi,range-microamp", tmp, 2); if (ret) - return ret; + goto err_child_out;

min = tmp[0] / 1000; max = tmp[1] / 1000; ret = ad5770r_store_output_range(st, min, max, num); if (ret) - return ret; + goto err_child_out; }

+ return 0; + +err_child_out: + fwnode_handle_put(child); return ret; }