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| author | Andreas Kemnade <andreas@kemnade.info> | 2018-09-17 08:20:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-25 11:52:32 +0300 |
| commit | d6e9e55c0dcf0db0d18a360e67ac30c2276aa09c (patch) | |
| tree | 06032b90e9140e908bbdbda8847be72a070bbc7c | |
| parent | 63ce52b6ee1685f3a3bac8e62dd526662adc89a3 (diff) | |
| download | linux-d6e9e55c0dcf0db0d18a360e67ac30c2276aa09c.tar.xz | |
power: supply: twl4030_charger: fix charging current out-of-bounds
[ Upstream commit 8314c212f995bc0d06b54ad02ef0ab4089781540 ]
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>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/power/supply/twl4030_charger.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c index bcd4dc304f27..14fed11e8f6e 100644 --- a/drivers/power/supply/twl4030_charger.c +++ b/drivers/power/supply/twl4030_charger.c @@ -449,7 +449,8 @@ 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) { |