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Subject[PATCH 3.18 12/35] USB: serial: mos7720: fix control-message error handling
Date
3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

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
@@ -236,11 +236,16 @@ 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;

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