1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 2cd77ab8fc66..054e05294af8 100644
--- 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;