net: ethernet: ti: fix possible object reference leak

[ Upstream commit 75eac7b5f68b0a0671e795ac636457ee27cc11d8 ]

The call to of_get_child_by_name returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./drivers/net/ethernet/ti/netcp_ethss.c:3661:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 3654, but without a corresponding object release within this function.
./drivers/net/ethernet/ti/netcp_ethss.c:3665:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 3654, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Wingman Kwok <w-kwok2@ti.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>

diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index d543298..ff24524 100644 (file)
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -3122,12 +3122,16 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
 
        ret = netcp_txpipe_init(&gbe_dev->tx_pipe, netcp_device,
                                gbe_dev->dma_chan_name, gbe_dev->tx_queue_id);
-       if (ret)
+       if (ret) {
+               of_node_put(interfaces);
                return ret;
+       }
 
        ret = netcp_txpipe_open(&gbe_dev->tx_pipe);
-       if (ret)
+       if (ret) {
+               of_node_put(interfaces);
                return ret;
+       }
 
        /* Create network interfaces */
        INIT_LIST_HEAD(&gbe_dev->gbe_intf_head);