Messages in this thread Patch in this message | | | From | "H. Nikolaus Schaller" <> | Subject | [PATCH] regulator: core: Fix error return for /sys access | Date | Tue, 10 Sep 2019 21:22:29 +0200 |
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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 <aford173@gmail.com> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> --- 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 e0c0cf462004..ea48cb5a68b8 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -564,13 +564,15 @@ 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); -- 2.19.1
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