FAILED: patch "[PATCH] iio:imu:st_lsm6dsx: check st_lsm6dsx_shub_read_output return" failed to apply to 5.4-stable tree

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 <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f71e41e23e129640f620b65fc362a6da02580310 Mon Sep 17 00:00:00 2001
From: Tom Rix <[email protected]>
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));
             ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

index ed83471dc7dd..8c8d8870ca07 100644
@@ -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);