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[173.230.104.22]) by smtp.gmail.com with ESMTPSA id m37sm12233667iti.6.2018.12.25.19.09.36 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 25 Dec 2018 19:09:37 -0800 (PST) From: Kangjie Lu To: kjlu@umn.edu Cc: pakki001@umn.edu, Alessandro Zummo , Alexandre Belloni , 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 Message-Id: <20181226030911.72845-1-kjlu@umn.edu> X-Mailer: git-send-email 2.17.2 (Apple Git-113) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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)