irqchip/gic-v3: Fix error handling in gic_populate_ppi_partitions

BugLink: https://bugs.launchpad.net/bugs/1983149
[ Upstream commit ec8401a429ffee34ccf38cebf3443f8d5ae6cb0d ]

of_get_child_by_name() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
When kcalloc fails, it missing of_node_put() and results in refcount
leak. Fix this by goto out_put_node label.

Fixes: 52085d3f2028 ("irqchip/gic-v3: Dynamically allocate PPI partition descriptors")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220601080930.31005-5-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 1269284461dae1cc22234f260cb290d14543975f..867a45aa069891684cc9e060d36a762bd596ceb2 100644 (file)
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1864,7 +1864,7 @@ static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
 
        gic_data.ppi_descs = kcalloc(gic_data.ppi_nr, sizeof(*gic_data.ppi_descs), GFP_KERNEL);
        if (!gic_data.ppi_descs)
-               return;
+               goto out_put_node;
 
        nr_parts = of_get_child_count(parts_node);