linux-kernel - [PATCH 4.19 302/639] firmware: arm_scmi: fix of_node leak in scmi_mailbox

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Message-Id: <20200124093124.784142120@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:27:52 +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, Steven Price <steven.price@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 302/639] firmware: arm_scmi: fix of_node leak in scmi_mailbox_check

From: Steven Price <steven.price@....com>

[ Upstream commit fa7fe29a645b4da08efe8ff2392898b88f9ded9f ]

of_parse_phandle_with_args() requires the caller to call of_node_put() on
the returned args->np pointer. Otherwise the reference count will remain
incremented.

However, in this case, since we don't actually use the returned pointer,
we can simply pass in NULL.

Fixes: aa4f886f3893f ("firmware: arm_scmi: add basic driver infrastructure for SCMI")
Signed-off-by: Steven Price <steven.price@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/arm_scmi/driver.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 09119e3f5c018..effc4c17e0fb9 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -662,9 +662,7 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
 
 static int scmi_mailbox_check(struct device_node *np)
 {
-	struct of_phandle_args arg;
-
-	return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells", 0, &arg);
+	return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells", 0, NULL);
 }
 
 static int scmi_mbox_free_channel(int id, void *p, void *data)
-- 
2.20.1