linux-kernel - [PATCH] iio: imu: st_lsm6dsx: check st_lsm6dsx_shub_read

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Message-Id: <20200809175551.6794-1-trix@redhat.com>
Date:   Sun,  9 Aug 2020 10:55:51 -0700
From:   trix@...hat.com
To:     lorenzo.bianconi83@...il.com, jic23@...nel.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] iio: imu: st_lsm6dsx: check st_lsm6dsx_shub_read_output return

From: Tom Rix <trix@...hat.com>

clang static analysis reports this represenative problem

st_lsm6dsx_shub.c:540:8: warning: Assigned value is garbage or undefined
        *val = (s16)le16_to_cpu(*((__le16 *)data));
             ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

data is set with

	err = st_lsm6dsx_shub_read(sensor, ch->address, data, len);
	if (err < 0)
		return err;

The problem with st_lsm6dsx_shub_read() is this statement

	err = st_lsm6dsx_shub_read_output(hw, data,
					  len & ST_LS6DSX_READ_OP_MASK);

The err value is never checked.
So check err.

Fixes: c91c1c844ebd ("iio: imu: st_lsm6dsx: add i2c embedded controller support")

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c
index ed83471dc7dd..8c8d8870ca07 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c
@@ -313,6 +313,8 @@ st_lsm6dsx_shub_read(struct st_lsm6dsx_sensor *sensor, u8 addr,
 
 	err = st_lsm6dsx_shub_read_output(hw, data,
 					  len & ST_LS6DSX_READ_OP_MASK);
+	if (err < 0)
+		return err;
 
 	st_lsm6dsx_shub_master_enable(sensor, false);
 
-- 
2.18.1