Patch "USB: serial: mos7720: fix control-message error handling" has been added to the 4.9-stable tree

Patch "USB: serial: mos7720: fix control-message error handling" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: serial: mos7720: fix control-message error handling

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-serial-mos7720-fix-control-message-error-handling.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct  5 10:28:31 CEST 2017
From: Johan Hovold <johan@kernel.org>
Date: Thu, 12 Jan 2017 14:56:17 +0100
Subject: USB: serial: mos7720: fix control-message error handling

From: Johan Hovold <johan@kernel.org>


[ Upstream commit 0d130367abf582e7cbf60075c2a7ab53817b1d14 ]

Make sure to log an error on short transfers when reading a device
register.

Also clear the provided buffer (which if often an uninitialised
automatic variable) on errors as the driver currently does not bother to
check for errors.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/serial/mos7720.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -234,11 +234,16 @@ static int read_mos_reg(struct usb_seria
 
 	status = usb_control_msg(usbdev, pipe, request, requesttype, value,
 				     index, buf, 1, MOS_WDR_TIMEOUT);
-	if (status == 1)
+	if (status == 1) {
 		*data = *buf;
-	else if (status < 0)
+	} else {
 		dev_err(&usbdev->dev,
 			"mos7720: usb_control_msg() failed: %d\n", status);
+		if (status >= 0)
+			status = -EIO;
+		*data = 0;
+	}
+
 	kfree(buf);
 
 	return status;


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.9/usb-serial-mos7720-fix-control-message-error-handling.patch
queue-4.9/usb-serial-mos7840-fix-control-message-error-handling.patch