linux-kernel - [PATCH] powerpc: sysdev: Fix refcount leak bug in mpic

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Date:   Fri, 17 Jun 2022 23:12:52 +0800
From:   Liang He <windhl@....com>
To:     mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        christophe.leroy@...roup.eu, joel@....id.au
Cc:     windhl@....com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: sysdev: Fix refcount leak bug in mpic_msgr

In mpic_msgr_number_of_blocks() and mpic_msgr_block_number(),
of_find_node_by_name() will return a node pointer with refcount
incremented. We should use of_node_put() when it is not used
anymore.

Signed-off-by: Liang He <windhl@....com>
---
 arch/powerpc/sysdev/mpic_msgr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
index 698fefaaa6dd..c2a235d9eb09 100644
--- a/arch/powerpc/sysdev/mpic_msgr.c
+++ b/arch/powerpc/sysdev/mpic_msgr.c
@@ -122,6 +122,7 @@ static unsigned int mpic_msgr_number_of_blocks(void)
 			count += 1;
 		}
 	}
+	of_node_put(aliases);
 
 	return count;
 }
@@ -150,6 +151,7 @@ static int mpic_msgr_block_number(struct device_node *node)
 		if (node == of_find_node_by_path(prop->value))
 			break;
 	}
+	of_node_put(aliases);
 
 	return index == number_of_blocks ? -1 : index;
 }
-- 
2.25.1