linux-kernel - [PATCH] drivers: mtd: Fix potential memory leak in mtd_check_of

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Message-ID: <20230621024517.1155-1-yangrong@vivo.com>
Date:   Wed, 21 Jun 2023 10:43:22 +0800
From:   Yang Rong <yangrong@...o.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org (open list:MEMORY TECHNOLOGY DEVICES
        (MTD)), linux-kernel@...r.kernel.org (open list)
Cc:     opensource.kernel@...o.com, luhongfei@...o.com,
        Yang Rong <yangrong@...o.com>
Subject: [PATCH] drivers: mtd: Fix potential memory leak in mtd_check_of_node

The for_each_child_of_node API internally increases the reference count
for each child node traversed. If a break statement is encountered inside
the loop, it leaves one reference unbalanced leading to a memory leak.

The function mtd_check_of_node in drivers/mtd/mtdcore.c uses such a loop
and a break statement without a corresponding of_node_put.

This patch fixes the potential memory leak by adding a call to
of_node_put before the break statement inside the for_each_child_of_node
loop in the function mtd_check_of_node.

Signed-off-by: Yang Rong <yangrong@...o.com>
---
 drivers/mtd/mtdcore.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index e00b12aa5ec9..b02cb8b1a38d 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -591,6 +591,7 @@ static void mtd_check_of_node(struct mtd_info *mtd)
                if (plen == mtd_name_len &&
                    !strncmp(mtd->name, pname + offset, plen)) {
                        mtd_set_of_node(mtd, mtd_dn);
+                       of_node_put(mtd_dn);
                        break;
                }
        }
--
2.35.3

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