From: Kangjie Lu <kjlu@umn.edu>
To: kjlu@umn.edu
Cc: pakki001@umn.edu, Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] rtc: fix a missing check of block data read
Date: Tue, 25 Dec 2018 21:09:11 -0600 [thread overview]
Message-ID: <20181226030911.72845-1-kjlu@umn.edu> (raw)
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>
---
drivers/rtc/rtc-hym8563.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/rtc/rtc-hym8563.c b/drivers/rtc/rtc-hym8563.c
index e5ad527cb75e..d03f5d212eea 100644
--- a/drivers/rtc/rtc-hym8563.c
+++ b/drivers/rtc/rtc-hym8563.c
@@ -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);
--
2.17.2 (Apple Git-113)
next reply other threads:[~2018-12-26 3:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-26 3:09 Kangjie Lu [this message]
2019-01-22 18:04 ` [PATCH] rtc: fix a missing check of block data read Alexandre Belloni
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