Use pkb_pad() rather than doing it the dangerous way :)

src/drivers/net/pnic.c

@@ -148,12 +148,9 @@ TRANSMIT - Transmit a frame
 ***************************************************************************/
 static int pnic_transmit ( struct net_device *netdev, struct pk_buff *pkb ) {
 	struct pnic *pnic = netdev->priv;
-	int pad_len;
 
-	/* Pad to minimum packet length */
-	pad_len = ( ETH_ZLEN - pkb_len ( pkb ) );
-	if ( pad_len > 0 )
-		memset ( pkb_put ( pkb, pad_len ), 0, pad_len );
+	/* Pad the packet */
+	pkb_pad ( pkb, ETH_ZLEN );
 
 	/* Send packet */
 	pnic_command ( pnic, PNIC_CMD_XMIT, pkb->data, pkb_len ( pkb ),