linux-kernel - [PATCH] firmware: arm_scmi: Fix leak in scmi_mailbox

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Message-Id: <20190325173722.49414-1-steven.price@arm.com>
Date:   Mon, 25 Mar 2019 17:37:22 +0000
From:   Steven Price <steven.price@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Steven Price <steven.price@....com>
Subject: [PATCH] firmware: arm_scmi: Fix leak in scmi_mailbox_check

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>
---
 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 8f952f2f1a29..dd967d675c08 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -654,9 +654,7 @@ 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