linux-kernel - [PATCH 4.19 179/321] powerpc/pseries: Fix node leak in update_lmb_associativity

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Message-Id: <20191203223436.441465025@linuxfoundation.org>
Date:   Tue,  3 Dec 2019 23:34:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 179/321] powerpc/pseries: Fix node leak in update_lmb_associativity_index()

From: Michael Ellerman <mpe@...erman.id.au>

[ Upstream commit 47918bc68b7427e961035949cc1501a864578a69 ]

In update_lmb_associativity_index() we lookup dr_node using
of_find_node_by_path() which takes a reference for us. In the
non-error case we forget to drop the reference. Note that
find_aa_index() does modify properties of the node, but doesn't need
an extra reference held once it's returned.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/platforms/pseries/hotplug-memory.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index d93ff494e7781..7f86bc3eaadec 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -202,6 +202,7 @@ static int update_lmb_associativity_index(struct drmem_lmb *lmb)
 
 	aa_index = find_aa_index(dr_node, ala_prop, lmb_assoc);
 
+	of_node_put(dr_node);
 	dlpar_free_cc_nodes(lmb_node);
 
 	if (aa_index < 0) {
-- 
2.20.1