Commit dbe7208c authored Apr 07, 2019 by Tony Lindgren Committed by Sebastian Reichel Apr 10, 2019

power: supply: cpcap-battery: Fix division by zero



If called fast enough so samples do not increment, we can get
division by zero in kernel:

__div0
cpcap_battery_cc_raw_div
cpcap_battery_get_property
power_supply_get_property.part.1
power_supply_get_property
power_supply_show_property
power_supply_uevent

Fixes: 874b2adb ("power: supply: cpcap-battery: Add a battery driver")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

parent 9e98c678

drivers/power/supply/cpcap-battery.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -221,6 +221,9 @@ static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata,
		int avg_current;
		u32 cc_lsb;

		if (!divider)
		return 0;

		sample &= 0xffffff; /* 24-bits, unsigned */
		offset &= 0x7ff; /* 10-bits, signed */