linux-kernel - [PATCH] irqchip/riscv-intc: Fix memory leak when riscv_intc_init

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Date: Mon, 27 May 2024 13:41:13 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Anup Patel <anup@...infault.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andrew Jones <ajones@...tanamicro.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Sunil V L <sunilvl@...tanamicro.com>
Subject: [PATCH] irqchip/riscv-intc: Fix memory leak when riscv_intc_init_common() fails

When riscv_intc_init_common() fails, the firmware node allocated is not
freed. Fix this memory leak.

Fixes: 7023b9d83f03 ("irqchip/riscv-intc: Add ACPI support")
Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/irqchip/irq-riscv-intc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
index 9e71c4428814..4f3a12383a1e 100644
--- a/drivers/irqchip/irq-riscv-intc.c
+++ b/drivers/irqchip/irq-riscv-intc.c
@@ -253,8 +253,9 @@ IRQCHIP_DECLARE(andes, "andestech,cpu-intc", riscv_intc_init);
 static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header,
 				       const unsigned long end)
 {
-	struct fwnode_handle *fn;
 	struct acpi_madt_rintc *rintc;
+	struct fwnode_handle *fn;
+	int rc;
 
 	rintc = (struct acpi_madt_rintc *)header;
 
@@ -273,7 +274,11 @@ static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header,
 		return -ENOMEM;
 	}
 
-	return riscv_intc_init_common(fn, &riscv_intc_chip);
+	rc = riscv_intc_init_common(fn, &riscv_intc_chip);
+	if (rc)
+		irq_domain_free_fwnode(fn);
+
+	return rc;
 }
 
 IRQCHIP_ACPI_DECLARE(riscv_intc, ACPI_MADT_TYPE_RINTC, NULL,
-- 
2.40.1