[PATCH] PCI: xilinx-xdma: Fix device node reference leak in xilinx_pl_dma_pcie_init_irq_domain()

[Wentao Liang]

xilinx_pl_dma_pcie_init_irq_domain() takes a reference to the PCIe
interrupt-controller child node with of_get_child_by_name(), but the
error paths after the two irq_domain_create_linear() calls and after
xilinx_pl_dma_pcie_init_msi_irq_domain() returns directly without
dropping it.  irq_domain_create_linear() gets its own reference on the
fwnode, so the domains do not consume the caller's one.

Add an err_put_node label that drops the reference before returning.

Fixes: 8d786149d78c ("PCI: xilinx-xdma: Add Xilinx XDMA Root Port driver")
Cc: stable at vger.kernel.org
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
 drivers/pci/controller/pcie-xilinx-dma-pl.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-xilinx-dma-pl.c b/drivers/pci/controller/pcie-xilinx-dma-pl.c
index b037c8f315e4..e18eeecdc8a9 100644
--- a/drivers/pci/controller/pcie-xilinx-dma-pl.c
+++ b/drivers/pci/controller/pcie-xilinx-dma-pl.c
@@ -581,7 +581,7 @@ static int xilinx_pl_dma_pcie_init_irq_domain(struct pl_dma_pcie *port)
 	port->pldma_domain = irq_domain_create_linear(of_fwnode_handle(pcie_intc_node), 32,
 						      &event_domain_ops, port);
 	if (!port->pldma_domain)
-		return -ENOMEM;
+		goto err_put_node;
 
 	irq_domain_update_bus_token(port->pldma_domain, DOMAIN_BUS_NEXUS);
 
@@ -589,7 +589,7 @@ static int xilinx_pl_dma_pcie_init_irq_domain(struct pl_dma_pcie *port)
 						     &intx_domain_ops, port);
 	if (!port->intx_domain) {
 		dev_err(dev, "Failed to get a INTx IRQ domain\n");
-		return -ENOMEM;
+		goto err_put_node;
 	}
 
 	irq_domain_update_bus_token(port->intx_domain, DOMAIN_BUS_WIRED);
@@ -597,13 +597,17 @@ static int xilinx_pl_dma_pcie_init_irq_domain(struct pl_dma_pcie *port)
 	ret = xilinx_pl_dma_pcie_init_msi_irq_domain(port);
 	if (ret != 0) {
 		irq_domain_remove(port->intx_domain);
-		return -ENOMEM;
+		goto err_put_node;
 	}
 
 	of_node_put(pcie_intc_node);
 	raw_spin_lock_init(&port->lock);
 
 	return 0;
+
+err_put_node:
+	of_node_put(pcie_intc_node);
+	return -ENOMEM;
 }
 
 static int xilinx_pl_dma_pcie_setup_irq(struct pl_dma_pcie *port)
-- 
2.34.1