linux-kernel - [PATCH v4 07/14] irqchip/dw-apb-ictl: Fix potential resource leaks

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Message-Id: <1593569786-11500-8-git-send-email-yangtiezhu@loongson.cn>
Date:   Wed,  1 Jul 2020 10:16:19 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Markus Elfring <Markus.Elfring@....de>
Subject: [PATCH v4 07/14] irqchip/dw-apb-ictl: Fix potential resource leaks

In the function dw_apb_ictl_init(), system resources "irq" and "domain"
were not released in a few error cases. Thus add jump targets for the
completion of the desired exception handling.

Fixes: 350d71b94fc9 ("irqchip: add DesignWare APB ICTL interrupt controller")
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 drivers/irqchip/irq-dw-apb-ictl.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-dw-apb-ictl.c b/drivers/irqchip/irq-dw-apb-ictl.c
index e4550e9..bc9b750 100644
--- a/drivers/irqchip/irq-dw-apb-ictl.c
+++ b/drivers/irqchip/irq-dw-apb-ictl.c
@@ -86,12 +86,13 @@ static int __init dw_apb_ictl_init(struct device_node *np,
 	ret = of_address_to_resource(np, 0, &r);
 	if (ret) {
 		pr_err("%pOF: unable to get resource\n", np);
-		return ret;
+		goto err_irq_dispose;
 	}
 
 	if (!request_mem_region(r.start, resource_size(&r), np->full_name)) {
 		pr_err("%pOF: unable to request mem region\n", np);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto err_irq_dispose;
 	}
 
 	iobase = ioremap(r.start, resource_size(&r));
@@ -133,7 +134,7 @@ static int __init dw_apb_ictl_init(struct device_node *np,
 					     IRQ_GC_INIT_MASK_CACHE);
 	if (ret) {
 		pr_err("%pOF: unable to alloc irq domain gc\n", np);
-		goto err_unmap;
+		goto err_domain_remove;
 	}
 
 	for (i = 0; i < DIV_ROUND_UP(nrirqs, 32); i++) {
@@ -150,10 +151,14 @@ static int __init dw_apb_ictl_init(struct device_node *np,
 
 	return 0;
 
+err_domain_remove:
+	irq_domain_remove(domain);
 err_unmap:
 	iounmap(iobase);
 err_release:
 	release_mem_region(r.start, resource_size(&r));
+err_irq_dispose:
+	irq_dispose_mapping(irq);
 	return ret;
 }
 IRQCHIP_DECLARE(dw_apb_ictl,
-- 
2.1.0