net: fec: fix the potential memory leak in fec_enet_init()

If the memory allocated for cbd_base is failed, it should
free the memory allocated for the queues, otherwise it causes
memory leak.

And if the memory allocated for the queues is failed, it can
return error directly.

Fixes: 59d0f746 ("net: fec: init multi queue date structure")
Signed-off-by: NFugang Duan <fugang.duan@nxp.com>
Signed-off-by: NJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec_main.c

@@ -3290,7 +3290,9 @@ static int fec_enet_init(struct net_device *ndev)
 		return ret;
 	}
 
-	fec_enet_alloc_queue(ndev);
+	ret = fec_enet_alloc_queue(ndev);
+	if (ret)
+		return ret;
 
 	bd_size = (fep->total_tx_ring_size + fep->total_rx_ring_size) * dsize;
 
@@ -3298,7 +3300,8 @@ static int fec_enet_init(struct net_device *ndev)
 	cbd_base = dmam_alloc_coherent(&fep->pdev->dev, bd_size, &bd_dma,
 				       GFP_KERNEL);
 	if (!cbd_base) {
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto free_queue_mem;
 	}
 
 	/* Get the Ethernet address */
@@ -3376,6 +3379,10 @@ static int fec_enet_init(struct net_device *ndev)
 		fec_enet_update_ethtool_stats(ndev);
 
 	return 0;
+
+free_queue_mem:
+	fec_enet_free_queue(ndev);
+	return ret;
 }
 
 #ifdef CONFIG_OF