rtc: rtc-isl1208: reject invalid dates

[linux-2.6-omap-h63xx.git] / drivers / rtc / rtc-isl1208.c

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 2cd77ab8fc66b06e43d3b908884a9f4fe8603ca1..054e05294af8566e30d3834fc23c793b615239f9 100644 (file)
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -328,6 +328,13 @@ isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
        int sr;
        u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
 
+       /* The clock has an 8 bit wide bcd-coded register (they never learn)
+        * for the year. tm_year is an offset from 1900 and we are interested
+        * in the 2000-2099 range, so any value less than 100 is invalid.
+        */
+       if (tm->tm_year < 100)
+               return -EINVAL;
+
        regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
        regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
        regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;