Use sizeof where possible to ensure we don't read/write more than the allocated buffer. Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx> --- drivers/rtc/rtc-ds1307.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 8de1d7116461..93fb08452159 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -650,7 +650,8 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id) mutex_lock(lock); /* Read control registers. */ - ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); + ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, + sizeof(ctl)); if (ret < 0) goto out; if (!(ctl[1] & RX8130_REG_FLAG_AF)) @@ -658,7 +659,8 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id) ctl[1] &= ~RX8130_REG_FLAG_AF; ctl[2] &= ~RX8130_REG_CONTROL0_AIE; - ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); + ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, + sizeof(ctl)); if (ret < 0) goto out; @@ -680,12 +682,14 @@ static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t) return -EINVAL; /* Read alarm registers. */ - ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3); + ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, + sizeof(ald)); if (ret < 0) return ret; /* Read control registers. */ - ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); + ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, + sizeof(ctl)); if (ret < 0) return ret; @@ -726,7 +730,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t) t->enabled, t->pending); /* Read control registers. */ - ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); + ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, + sizeof(ctl)); if (ret < 0) return ret; @@ -734,7 +739,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t) ctl[1] |= RX8130_REG_FLAG_AF; ctl[2] &= ~RX8130_REG_CONTROL0_AIE; - ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); + ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, + sizeof(ctl)); if (ret < 0) return ret; @@ -743,7 +749,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t) ald[1] = bin2bcd(t->time.tm_hour); ald[2] = bin2bcd(t->time.tm_mday); - ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3); + ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, + sizeof(ald)); if (ret < 0) return ret; @@ -752,7 +759,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t) ctl[2] |= RX8130_REG_CONTROL0_AIE; - return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); + return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, + sizeof(ctl)); } static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled) -- 2.14.1
