linux-kernel - [PATCH] powerpc: platforms: 52xx: Fix refcount leak in media5200.c

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Message-Id: <20220616144007.3987743-1-windhl@126.com>
Date:   Thu, 16 Jun 2022 22:40:07 +0800
From:   Liang He <windhl@....com>
To:     mpe@...erman.id.au, agust@...x.de, benh@...nel.crashing.org,
        paulus@...ba.org, christophe.leroy@...roup.eu, maz@...nel.org,
        wangqing@...o.com
Cc:     windhl@....com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: platforms: 52xx: Fix refcount leak in media5200.c

In media5200_init_irq(), of_find_compatible_node() will return a
node pointer with refcount incremented. We should use of_node_put()
in fail path or when it is not used anymore.

Don't worry about 'fpga_np==NULL' as of_node_put() can correctly
handle it.

Signed-off-by: Liang He <windhl@....com>
---
 arch/powerpc/platforms/52xx/media5200.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/52xx/media5200.c b/arch/powerpc/platforms/52xx/media5200.c
index ee367ff3ec8a..33a35fff11b5 100644
--- a/arch/powerpc/platforms/52xx/media5200.c
+++ b/arch/powerpc/platforms/52xx/media5200.c
@@ -174,6 +174,8 @@ static void __init media5200_init_irq(void)
 		goto out;
 	pr_debug("%s: allocated irqhost\n", __func__);
 
+	of_node_put(fpga_np);
+
 	irq_set_handler_data(cascade_virq, &media5200_irq);
 	irq_set_chained_handler(cascade_virq, media5200_irq_cascade);
 
@@ -181,6 +183,7 @@ static void __init media5200_init_irq(void)
 
  out:
 	pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n");
+	of_node_put(fpga_np);
 }
 
 /*
-- 
2.25.1