linux-kernel - [PATCH v4 03/14] irqchip/csky-mpintc: Fix potential resource leaks

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Message-Id: <1593569786-11500-4-git-send-email-yangtiezhu@loongson.cn>
Date:   Wed,  1 Jul 2020 10:16:15 +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 03/14] irqchip/csky-mpintc: Fix potential resource leaks

In the function csky_mpintc_init(), system resources "__trigger",
"INTCG_base" and "root_domain" were not released in a few error
cases. Thus add jump targets for the completion of the desired
exception handling. By the way, do some coding-style cleanups
suggested by Markus.

Fixes: d8a5f5f79122 ("irqchip: add C-SKY SMP interrupt controller")
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 drivers/irqchip/irq-csky-mpintc.c | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-csky-mpintc.c b/drivers/irqchip/irq-csky-mpintc.c
index a1534ed..d7edc28 100644
--- a/drivers/irqchip/irq-csky-mpintc.c
+++ b/drivers/irqchip/irq-csky-mpintc.c
@@ -241,14 +241,16 @@ csky_mpintc_init(struct device_node *node, struct device_node *parent)
 		nr_irq = INTC_IRQS;
 
 	__trigger  = kcalloc(nr_irq, sizeof(unsigned long), GFP_KERNEL);
-	if (__trigger == NULL)
+	if (!__trigger)
 		return -ENXIO;
 
-	if (INTCG_base == NULL) {
+	if (!INTCG_base) {
 		INTCG_base = ioremap(mfcr("cr<31, 14>"),
-				     INTCL_SIZE*nr_cpu_ids + INTCG_SIZE);
-		if (INTCG_base == NULL)
-			return -EIO;
+				     INTCL_SIZE * nr_cpu_ids + INTCG_SIZE);
+		if (!INTCG_base) {
+			ret = -EIO;
+			goto err_free;
+		}
 
 		INTCL_base = INTCG_base + INTCG_SIZE;
 
@@ -257,8 +259,10 @@ csky_mpintc_init(struct device_node *node, struct device_node *parent)
 
 	root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops,
 					    NULL);
-	if (!root_domain)
-		return -ENXIO;
+	if (!root_domain) {
+		ret = -ENXIO;
+		goto err_iounmap;
+	}
 
 	/* for every cpu */
 	for_each_present_cpu(cpu) {
@@ -270,12 +274,24 @@ csky_mpintc_init(struct device_node *node, struct device_node *parent)
 
 #ifdef CONFIG_SMP
 	ipi_irq = irq_create_mapping(root_domain, IPI_IRQ);
-	if (!ipi_irq)
-		return -EIO;
+	if (!ipi_irq) {
+		ret = -EIO;
+		goto err_domain_remove;
+	}
 
 	set_send_ipi(&csky_mpintc_send_ipi, ipi_irq);
 #endif
 
 	return 0;
+
+#ifdef CONFIG_SMP
+err_domain_remove:
+	irq_domain_remove(root_domain);
+#endif
+err_iounmap:
+	iounmap(INTCG_base);
+err_free:
+	kfree(__trigger);
+	return ret;
 }
 IRQCHIP_DECLARE(csky_mpintc, "csky,mpintc", csky_mpintc_init);
-- 
2.1.0