releases/6.10.3/irqdomain-fixed-unbalanced-fwnode-get-and-put.patch

From 6ce3e98184b625d2870991880bf9586ded7ea7f9 Mon Sep 17 00:00:00 2001
From: Herve Codina <herve.codina@bootlin.com>
Date: Fri, 14 Jun 2024 19:32:04 +0200
Subject: irqdomain: Fixed unbalanced fwnode get and put

From: Herve Codina <herve.codina@bootlin.com>

commit 6ce3e98184b625d2870991880bf9586ded7ea7f9 upstream.

fwnode_handle_get(fwnode) is called when a domain is created with fwnode
passed as a function parameter. fwnode_handle_put(domain->fwnode) is called
when the domain is destroyed but during the creation a path exists that
does not set domain->fwnode.

If this path is taken, the fwnode get will never be put.

To avoid the unbalanced get and put, set domain->fwnode unconditionally.

Fixes: d59f6617eef0 ("genirq: Allow fwnode to carry name information only")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240614173232.1184015-4-herve.codina@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 kernel/irq/irqdomain.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -155,7 +155,6 @@ static struct irq_domain *__irq_domain_c
 		switch (fwid->type) {
 		case IRQCHIP_FWNODE_NAMED:
 		case IRQCHIP_FWNODE_NAMED_ID:
-			domain->fwnode = fwnode;
 			domain->name = kstrdup(fwid->name, GFP_KERNEL);
 			if (!domain->name) {
 				kfree(domain);
@@ -164,7 +163,6 @@ static struct irq_domain *__irq_domain_c
 			domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 			break;
 		default:
-			domain->fwnode = fwnode;
 			domain->name = fwid->name;
 			break;
 		}
@@ -184,7 +182,6 @@ static struct irq_domain *__irq_domain_c
 		}
 
 		domain->name = strreplace(name, '/', ':');
-		domain->fwnode = fwnode;
 		domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 	}
 
@@ -200,8 +197,8 @@ static struct irq_domain *__irq_domain_c
 		domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 	}
 
-	fwnode_handle_get(fwnode);
-	fwnode_dev_initialized(fwnode, true);
+	domain->fwnode = fwnode_handle_get(fwnode);
+	fwnode_dev_initialized(domain->fwnode, true);
 
 	/* Fill structure */
 	INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);