can: kvaser_usb: Fix comparison bug in kvaser_usb_read_bulk_callback()

The conditon in the while-loop becomes true when actual_length is less than
2 (MSG_HEADER_LEN). In best case we end up with a former, already
dispatched msg, that got msg->len greater than actual_length. This will
result in a "Format error" error printout.

Problem seen when unplugging a Kvaser USB device connected to a vbox guest.

warning: comparison between signed and unsigned integer expressions
[-Wsign-compare]

Signed-off-by: Jimmy Assarsson <jimmyassarsson@gmail.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 0756445914981e6e4b87eb78a39b2971d143b073..d87e330a20b3f4821fccde5ebd9aea44a1f93489 100644 (file)
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -1334,7 +1334,7 @@ static void kvaser_usb_read_bulk_callback(struct urb *urb)
                goto resubmit_urb;
        }
 
-       while (pos <= urb->actual_length - MSG_HEADER_LEN) {
+       while (pos <= (int)(urb->actual_length - MSG_HEADER_LEN)) {
                msg = urb->transfer_buffer + pos;
 
                /* The Kvaser firmware can only read and write messages that