Commit 9ad66b78 authored Sep 12, 2018 by David Lechner Committed by Greg Kroah-Hartman Oct 05, 2019

power: supply: sysfs: ratelimit property read error message



[ Upstream commit 87a2b65fc855e6be50f791c2ebbb492541896827 ]

This adds rate limiting to the message that is printed when reading a
power supply property via sysfs returns an error. This will prevent
userspace applications from unintentionally dDOSing the system by
continuously reading a property that returns an error.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 7b1f4ffa

drivers/power/supply/power_supply_sysfs.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -84,7 +84,8 @@ static ssize_t power_supply_show_property(struct device *dev,
		dev_dbg(dev, "driver has no data for `%s' property\n",
		attr->attr.name);
		else if (ret != -ENODEV && ret != -EAGAIN)
		dev_err(dev, "driver failed to report `%s' property: %zd\n",
		dev_err_ratelimited(dev,
		"driver failed to report `%s' property: %zd\n",
		attr->attr.name, ret);
		return ret;
		}