"old_rdtodo" and "size" are short type. They are type promoted to int
and the condition is never true.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index 7814262..6e1b69d 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -279,7 +279,7 @@ static void cyberjack_read_int_callback(struct urb *urb)
old_rdtodo = priv->rdtodo;
- if (old_rdtodo + size < old_rdtodo) {
+ if (old_rdtodo > SHRT_MAX - size) {
dev_dbg(dev, "To many bulk_in urbs to do.\n");
spin_unlock(&priv->lock);
goto resubmit;
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