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rtc: hym8563: fix a missing check of block data read 

When i2c_smbus_read_i2c_block_data() fails, the read data in "buf" could
be incorrect and should not be used. The fix checks if
i2c_smbus_read_i2c_block_data fails, and if so, return its error code
upstream.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Kangjie Lu 2018-12-25 21:09:11 -06:00 committed by Alexandre Belloni
parent 5910fa0d0d
commit 9a20b5e35a
1 changed files with 2 additions and 0 deletions
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2
drivers/rtc/rtc-hym8563.c
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@ -109,6 +109,8 @@ static int hym8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
}
ret = i2c_smbus_read_i2c_block_data(client, HYM8563_SEC, 7, buf);
if (ret < 0)
return ret;
tm->tm_sec = bcd2bin(buf[0] & HYM8563_SEC_MASK);
tm->tm_min = bcd2bin(buf[1] & HYM8563_MIN_MASK);