From: Ondrej Jirman Date: Fri, 28 Oct 2022 22:40:52 +0000 (+0200) Subject: power: supply: ip5xxx: Fix integer overflow in current_now calculation X-Git-Tag: v6.6.17~6124^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f9be5cb6c1f0191f8bcf4413b7e17e58e8dfaaa1;p=platform%2Fkernel%2Flinux-rpi.git power: supply: ip5xxx: Fix integer overflow in current_now calculation When current is larger than ~2A, the multiplication in current_now property overflows and the kernel reports invalid negative current value. Change the numerator and denominator while preserving their ratio to allow up to +-6A before the overflow. Fixes: 75853406fa27 ("power: supply: Add a driver for Injoinic power bank ICs") Signed-off-by: Ondrej Jirman Reviewed-by: Samuel Holland [use 149197/200 instead of 261095/350 as suggested by Samuel] Signed-off-by: Sebastian Reichel --- diff --git a/drivers/power/supply/ip5xxx_power.c b/drivers/power/supply/ip5xxx_power.c index 218e8e6..00221e9 100644 --- a/drivers/power/supply/ip5xxx_power.c +++ b/drivers/power/supply/ip5xxx_power.c @@ -352,7 +352,7 @@ static int ip5xxx_battery_get_property(struct power_supply *psy, ret = ip5xxx_battery_read_adc(ip5xxx, IP5XXX_BATIADC_DAT0, IP5XXX_BATIADC_DAT1, &raw); - val->intval = DIV_ROUND_CLOSEST(raw * 745985, 1000); + val->intval = DIV_ROUND_CLOSEST(raw * 149197, 200); return 0; case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: