The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From da4410d4078ba4ead9d6f1027d6db77c5a74ecee Mon Sep 17 00:00:00 2001
From: Tobias Jordan kernel@cdqe.de Date: Sat, 26 Sep 2020 18:19:46 +0200 Subject: [PATCH] iio: adc: gyroadc: fix leak of device node iterator
Add missing of_node_put calls when exiting the for_each_child_of_node loop in rcar_gyroadc_parse_subdevs early.
Also add goto-exception handling for the error paths in that loop.
Fixes: 059c53b32329 ("iio: adc: Add Renesas GyroADC driver") Signed-off-by: Tobias Jordan kernel@cdqe.de Link: https://lore.kernel.org/r/20200926161946.GA10240@agrajag.zerfleddert.de Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com
diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c index dcaefc108ff6..9f38cf3c7dc2 100644 --- a/drivers/iio/adc/rcar-gyroadc.c +++ b/drivers/iio/adc/rcar-gyroadc.c @@ -357,7 +357,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3); break; default: - return -EINVAL; + goto err_e_inval; }
/* @@ -374,7 +374,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) dev_err(dev, "Failed to get child reg property of ADC "%pOFn".\n", child); - return ret; + goto err_of_node_put; }
/* Channel number is too high. */ @@ -382,7 +382,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) dev_err(dev, "Only %i channels supported with %pOFn, but reg = <%i>.\n", num_channels, child, reg); - return -EINVAL; + goto err_e_inval; } }
@@ -391,7 +391,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) dev_err(dev, "Channel %i uses different ADC mode than the rest.\n", reg); - return -EINVAL; + goto err_e_inval; }
/* Channel is valid, grab the regulator. */ @@ -401,7 +401,8 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) if (IS_ERR(vref)) { dev_dbg(dev, "Channel %i 'vref' supply not connected.\n", reg); - return PTR_ERR(vref); + ret = PTR_ERR(vref); + goto err_of_node_put; }
priv->vref[reg] = vref; @@ -425,8 +426,10 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) * attached to the GyroADC at a time, so if we found it, * we can stop parsing here. */ - if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) { + of_node_put(child); break; + } }
if (first) { @@ -435,6 +438,12 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) }
return 0; + +err_e_inval: + ret = -EINVAL; +err_of_node_put: + of_node_put(child); + return ret; }
static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev)