From: Enrico Scholz Date: Fri, 27 Nov 2015 12:02:55 +0000 (+0100) Subject: rtc: da9063: avoid writing undefined data to rtc X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2ad2c17480b6208a35a4ffb937effe0ba1ed39de;p=linux-beck.git rtc: da9063: avoid writing undefined data to rtc driver did | static void da9063_tm_to_data(struct rtc_time *tm, u8 *data, | { | const struct da9063_compatible_rtc_regmap *config = rtc->config; | | data[RTC_SEC] &= ~config->rtc_count_sec_mask; | data[RTC_SEC] |= tm->tm_sec & config->rtc_count_sec_mask; | ... | } | ... | static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm) | { | ... | u8 data[RTC_DATA_LEN]; | int ret; | | da9063_tm_to_data(tm, data, rtc); which means that some bits of stack content (in 'data[]') was masked out and written to the RTC. Because da9063_tm_to_data() is used only by da9063_rtc_set_time() and da9063_rtc_set_alarm(), we can write fields directly. Signed-off-by: Enrico Scholz Acked-by: Steve Twiss Tested-by: Steve Twiss Signed-off-by: Alexandre Belloni --- diff --git a/drivers/rtc/rtc-da9063.c b/drivers/rtc/rtc-da9063.c index d6c853bbfa9f..f85cae240f12 100644 --- a/drivers/rtc/rtc-da9063.c +++ b/drivers/rtc/rtc-da9063.c @@ -191,24 +191,13 @@ static void da9063_tm_to_data(struct rtc_time *tm, u8 *data, { const struct da9063_compatible_rtc_regmap *config = rtc->config; - data[RTC_SEC] &= ~config->rtc_count_sec_mask; - data[RTC_SEC] |= tm->tm_sec & config->rtc_count_sec_mask; - - data[RTC_MIN] &= ~config->rtc_count_min_mask; - data[RTC_MIN] |= tm->tm_min & config->rtc_count_min_mask; - - data[RTC_HOUR] &= ~config->rtc_count_hour_mask; - data[RTC_HOUR] |= tm->tm_hour & config->rtc_count_hour_mask; - - data[RTC_DAY] &= ~config->rtc_count_day_mask; - data[RTC_DAY] |= tm->tm_mday & config->rtc_count_day_mask; - - data[RTC_MONTH] &= ~config->rtc_count_month_mask; - data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) & + data[RTC_SEC] = tm->tm_sec & config->rtc_count_sec_mask; + data[RTC_MIN] = tm->tm_min & config->rtc_count_min_mask; + data[RTC_HOUR] = tm->tm_hour & config->rtc_count_hour_mask; + data[RTC_DAY] = tm->tm_mday & config->rtc_count_day_mask; + data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) & config->rtc_count_month_mask; - - data[RTC_YEAR] &= ~config->rtc_count_year_mask; - data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) & + data[RTC_YEAR] = YEARS_TO_DA9063(tm->tm_year) & config->rtc_count_year_mask; }