From b450e335fb186f9d55952f1d26b8b7b55f57f790 Mon Sep 17 00:00:00 2001 From: Su Hui Date: Thu, 16 Nov 2023 12:18:23 +0800 Subject: [PATCH] power: supply: bq256xx: fix some problem in bq256xx_hw_init [ Upstream commit b55d073e6501dc6077edaa945a6dad8ac5c8bbab ] smatch complains that there is a buffer overflow and clang complains 'ret' is never read. Smatch error: drivers/power/supply/bq256xx_charger.c:1578 bq256xx_hw_init() error: buffer overflow 'bq256xx_watchdog_time' 4 <= 4 Clang static checker: Value stored to 'ret' is never read. Add check for buffer overflow and error code from regmap_update_bits(). Fixes: 32e4978bb920 ("power: supply: bq256xx: Introduce the BQ256XX charger driver") Signed-off-by: Su Hui Link: https://lore.kernel.org/r/20231116041822.1378758-1-suhui@nfschina.com Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/bq256xx_charger.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/power/supply/bq256xx_charger.c b/drivers/power/supply/bq256xx_charger.c index 82d3cd5..c8368da 100644 --- a/drivers/power/supply/bq256xx_charger.c +++ b/drivers/power/supply/bq256xx_charger.c @@ -1574,13 +1574,16 @@ static int bq256xx_hw_init(struct bq256xx_device *bq) wd_reg_val = i; break; } - if (bq->watchdog_timer > bq256xx_watchdog_time[i] && + if (i + 1 < BQ256XX_NUM_WD_VAL && + bq->watchdog_timer > bq256xx_watchdog_time[i] && bq->watchdog_timer < bq256xx_watchdog_time[i + 1]) wd_reg_val = i; } ret = regmap_update_bits(bq->regmap, BQ256XX_CHARGER_CONTROL_1, BQ256XX_WATCHDOG_MASK, wd_reg_val << BQ256XX_WDT_BIT_SHIFT); + if (ret) + return ret; ret = power_supply_get_battery_info(bq->charger, &bat_info); if (ret == -ENOMEM) -- 2.7.4