irqchip/riscv-intc: Prevent memory leak when riscv_intc_init_common()…

… fails

BugLink: https://bugs.launchpad.net/bugs/2073788

commit 0110c4b upstream.

When riscv_intc_init_common() fails, the firmware node allocated is not
freed. Add the missing free().

Fixes: 7023b9d ("irqchip/riscv-intc: Add ACPI support")
Signed-off-by: Sunil V L <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Portia Stephens <[email protected]>
Signed-off-by: Roxana Nicolescu <[email protected]>

drivers/irqchip/irq-riscv-intc.c

@@ -176,8 +176,9 @@ IRQCHIP_DECLARE(riscv, "riscv,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;
 
@@ -196,7 +197,11 @@ static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header,
 		return -ENOMEM;
 	}
 
-	return riscv_intc_init_common(fn);
+	rc = riscv_intc_init_common(fn);
+	if (rc)
+		irq_domain_free_fwnode(fn);
+
+	return rc;
 }
 
 IRQCHIP_ACPI_DECLARE(riscv_intc, ACPI_MADT_TYPE_RINTC, NULL,