irqchip/gic-v2m: Fix refcount leak in gicv2m_of_init()

commit c5af2c90ba5629f0424a8d315f75fb8d91713c3c upstream.

gicv2m_of_init() fails to perform an of_node_put() when
of_address_to_resource() fails, leading to a refcount leak.

Address this by moving the error handling path outside of the loop and
making it common to all failure modes.

Fixes: 4266ab1a8ff5 ("irqchip/gic-v2m: Refactor to prepare for ACPI support")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240820092843.1219933-1-make24@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 4116b48e60aff8710ccf7e4472c6a6e79a4f0724..205a27519607457b7ae9dafbdaae2a3e8869a807 100644 (file)
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -442,12 +442,12 @@ static int __init gicv2m_of_init(struct fwnode_handle *parent_handle,
 
                ret = gicv2m_init_one(&child->fwnode, spi_start, nr_spis,
                                      &res, 0);
-               if (ret) {
-                       of_node_put(child);
+               if (ret)
                        break;
-               }
        }
 
+       if (ret && child)
+               of_node_put(child);
        if (!ret)
                ret = gicv2m_allocate_domains(parent);
        if (ret)