linux-kernel - [PATCH] tty: serial: Fix refcount leak bug in ucc

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Message-Id: <20220618060850.4058525-1-windhl@126.com>
Date:   Sat, 18 Jun 2022 14:08:50 +0800
From:   Liang He <windhl@....com>
To:     timur@...nel.org, gregkh@...uxfoundation.org, jirislaby@...nel.org
Cc:     windhl@....com, linuxppc-dev@...ts.ozlabs.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] tty: serial: Fix refcount leak bug in ucc_uart.c

In soc_info(), of_find_node_by_type() 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>
---
 drivers/tty/serial/ucc_uart.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index 6000853973c1..3cc9ef08455c 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -1137,6 +1137,8 @@ static unsigned int soc_info(unsigned int *rev_h, unsigned int *rev_l)
 		/* No compatible property, so try the name. */
 		soc_string = np->name;
 
+	of_node_put(np);
+
 	/* Extract the SOC number from the "PowerPC," string */
 	if ((sscanf(soc_string, "PowerPC,%u", &soc) != 1) || !soc)
 		return 0;
-- 
2.25.1