usbip: Fix seqnum sign extension issue in vhci_tx_urb

The atomic_inc_return function returns an int, while priv->seqnum is an
unsigned long. So we must cast the result to u32 to prevent potential
sign extension and size mismatch issues.

Signed-off-by: Xiong Nandi <[email protected]>
Acked-by: Shuah Khan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: xndcn

drivers/usb/usbip/vhci_hcd.c

@@ -676,7 +676,7 @@ static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
 
 	spin_lock_irqsave(&vdev->priv_lock, flags);
 
-	priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
+	priv->seqnum = (u32)atomic_inc_return(&vhci_hcd->seqnum);
 	if (priv->seqnum == 0xffff)
 		dev_info(&urb->dev->dev, "seqnum max\n");