From c82f27df07573ec7b124efe176d2ac6c038787a5 Mon Sep 17 00:00:00 2001 From: "H. Nikolaus Schaller" Date: Tue, 10 Sep 2019 21:22:29 +0200 Subject: [PATCH] regulator: core: Fix error return for /sys access MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit regulator_uV_show() is missing error handling if regulator_get_voltage_rdev() returns negative values. Instead it prints the errno as a string, e.g. -EINVAL as "-22" which could be interpreted as -22 µV. We also do not need to hold the lock while converting the integer to a string. Reported-by: Adam Ford Signed-off-by: H. Nikolaus Schaller Tested-by: Adam Ford Link: https://lore.kernel.org/r/f37f2a1276efcb34cf3b7f1a25481175be048806.1568143348.git.hns@goldelico.com Signed-off-by: Mark Brown --- drivers/regulator/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 340db986b67ff..afe94470b67f7 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -568,13 +568,15 @@ static ssize_t regulator_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); - ssize_t ret; + int uV; regulator_lock(rdev); - ret = sprintf(buf, "%d\n", regulator_get_voltage_rdev(rdev)); + uV = regulator_get_voltage_rdev(rdev); regulator_unlock(rdev); - return ret; + if (uV < 0) + return uV; + return sprintf(buf, "%d\n", uV); } static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); -- 2.30.2