| Message ID | 20180826201725.10220-1-andreas@kemnade.info (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | twl4030_charger: fix charging current out-of-bounds | expand |
diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c index b72838663872..c954b7234393 100644 --- a/drivers/power/supply/twl4030_charger.c +++ b/drivers/power/supply/twl4030_charger.c @@ -421,7 +421,8 @@ static void twl4030_current_worker(struct work_struct *data) if (v < USB_MIN_VOLT) { /* Back up and stop adjusting. */ - bci->usb_cur -= USB_CUR_STEP; + if (bci->usb_cur >= USB_CUR_STEP) + bci->usb_cur -= USB_CUR_STEP; bci->usb_cur_target = bci->usb_cur; } else if (bci->usb_cur >= bci->usb_cur_target || bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
the charging current uses unsigned int variables, if we step back if the current is still low, we would run into negative which means setting the target to a huge value. Better add checks here. Signed-off-by: Andreas Kemnade <andreas@kemnade.info> --- drivers/power/supply/twl4030_charger.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)