linux-kernel - [PATCH 4.19 114/287] mtd: maps: Fix refcount leak in of_flash_probe

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Message-Id: <20220823080104.218462230@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:24:43 +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>,
        Linus Walleij <linus.walleij@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 114/287] mtd: maps: Fix refcount leak in of_flash_probe_versatile

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

[ Upstream commit 33ec82a6d2b119938f26e5c8040ed5d92378eb54 ]

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

Fixes: b0afd44bc192 ("mtd: physmap_of: add a hook for Versatile write protection")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lore.kernel.org/linux-mtd/20220523140205.48625-1-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mtd/maps/physmap_of_versatile.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/maps/physmap_of_versatile.c b/drivers/mtd/maps/physmap_of_versatile.c
index 03f2b6e7bc7e..961704228dd2 100644
--- a/drivers/mtd/maps/physmap_of_versatile.c
+++ b/drivers/mtd/maps/physmap_of_versatile.c
@@ -221,6 +221,7 @@ int of_flash_probe_versatile(struct platform_device *pdev,
 
 		versatile_flashprot = (enum versatile_flashprot)devid->data;
 		rmap = syscon_node_to_regmap(sysnp);
+		of_node_put(sysnp);
 		if (IS_ERR(rmap))
 			return PTR_ERR(rmap);
 
-- 
2.35.1