Patch "irqchip: Fix refcount leak in platform_irqchip_probe" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    irqchip: Fix refcount leak in platform_irqchip_probe

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     irqchip-fix-refcount-leak-in-platform_irqchip_probe.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f16065041be93f9833e000aa02dadadc2205099d
Author: Miaoqian Lin <linmq006@xxxxxxxxx>
Date:   Mon Jan 2 16:13:18 2023 +0400

    irqchip: Fix refcount leak in platform_irqchip_probe
    
    [ Upstream commit 6caa5a2b78f5f53c433d3a3781e53325da22f0ac ]
    
    of_irq_find_parent() returns a node pointer with refcount incremented,
    We should use of_node_put() on it when not needed anymore.
    Add missing of_node_put() to avoid refcount leak.
    
    Fixes: f8410e626569 ("irqchip: Add IRQCHIP_PLATFORM_DRIVER_BEGIN/END and IRQCHIP_MATCH helper macros")
    Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
    Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230102121318.3990586-1-linmq006@xxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c
index 3570f0a588c4b..7899607fbee8d 100644
--- a/drivers/irqchip/irqchip.c
+++ b/drivers/irqchip/irqchip.c
@@ -38,8 +38,10 @@ int platform_irqchip_probe(struct platform_device *pdev)
 	struct device_node *par_np = of_irq_find_parent(np);
 	of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
 
-	if (!irq_init_cb)
+	if (!irq_init_cb) {
+		of_node_put(par_np);
 		return -EINVAL;
+	}
 
 	if (par_np == np)
 		par_np = NULL;
@@ -52,8 +54,10 @@ int platform_irqchip_probe(struct platform_device *pdev)
 	 * interrupt controller. The actual initialization callback of this
 	 * interrupt controller can check for specific domains as necessary.
 	 */
-	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY))
+	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY)) {
+		of_node_put(par_np);
 		return -EPROBE_DEFER;
+	}
 
 	return irq_init_cb(np, par_np);
 }