The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From f71e41e23e129640f620b65fc362a6da02580310 Mon Sep 17 00:00:00 2001
From: Tom Rix <trix@xxxxxxxxxx>
Date: Sun, 9 Aug 2020 10:55:51 -0700
Subject: [PATCH] iio:imu:st_lsm6dsx: check st_lsm6dsx_shub_read_output return
Potential error return is not checked. This can lead to use
of undefined data.
Detected by clang static analysis.
st_lsm6dsx_shub.c:540:8: warning: Assigned value is garbage or undefined
*val = (s16)le16_to_cpu(*((__le16 *)data));
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fixes: c91c1c844ebd ("iio: imu: st_lsm6dsx: add i2c embedded controller support")
Signed-off-by: Tom Rix <trix@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Link: https://lore.kernel.org/r/20200809175551.6794-1-trix@xxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
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);
