linux-kernel - [PATCH 5.18 0938/1095] powerpc/cell/axon_msi: Fix refcount leak in setup_msi_msg

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Message-Id: <20220815180508.011278501@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:05:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0938/1095] powerpc/cell/axon_msi: Fix refcount leak in setup_msi_msg_address

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit df5d4b616ee76abc97e5bd348e22659c2b095b1c ]

of_get_next_parent() returns a node pointer with refcount incremented,
we should use of_node_put() on it when not need anymore.
Add missing of_node_put() in the error path to avoid refcount leak.

Fixes: ce21b3c9648a ("[CELL] add support for MSI on Axon-based Cell systems")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20220605065129.63906-1-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/platforms/cell/axon_msi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/platforms/cell/axon_msi.c b/arch/powerpc/platforms/cell/axon_msi.c
index 354a58c1e6f2..dba34f4d5162 100644
--- a/arch/powerpc/platforms/cell/axon_msi.c
+++ b/arch/powerpc/platforms/cell/axon_msi.c
@@ -223,6 +223,7 @@ static int setup_msi_msg_address(struct pci_dev *dev, struct msi_msg *msg)
 	if (!prop) {
 		dev_dbg(&dev->dev,
 			"axon_msi: no msi-address-(32|64) properties found\n");
+		of_node_put(dn);
 		return -ENOENT;
 	}
 
-- 
2.35.1