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 4.4-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-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Thu Oct 5 10:49:14 CEST 2017 From: Johan Hovold <johan@xxxxxxxxxx> Date: Thu, 12 Jan 2017 14:56:17 +0100 Subject: USB: serial: mos7720: fix control-message error handling From: Johan Hovold <johan@xxxxxxxxxx> [ 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@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxxxxx are queue-4.4/usb-serial-mos7720-fix-control-message-error-handling.patch queue-4.4/usb-serial-mos7840-fix-control-message-error-handling.patch