netdev - [PATCH] devlink: fix memory leak in ifname_map_rtnl

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Message-Id: <20241125032454.35392-1-heminhong@kylinos.cn>
Date: Mon, 25 Nov 2024 11:24:54 +0800
From: Minhong He <heminhong@...inos.cn>
To: stephen@...workplumber.org,
	netdev@...r.kernel.org
Cc: Minhong He <heminhong@...inos.cn>
Subject: [PATCH] devlink: fix memory leak in ifname_map_rtnl_init()

When the return value of rtnl_talk() is greater than
or equal to 0, 'answer' will be allocated.
The 'answer' should be free after using,
otherwise it will cause memory leak.

Signed-off-by: Minhong He <heminhong@...inos.cn>
---
 devlink/devlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 9907712e..abe96f34 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -846,7 +846,7 @@ static int ifname_map_rtnl_init(struct dl *dl, const char *ifname)
 	struct rtattr *tb[IFLA_MAX + 1];
 	struct rtnl_handle rth;
 	struct ifinfomsg *ifi;
-	struct nlmsghdr *n;
+	struct nlmsghdr *n = NULL;
 	int len;
 	int err;
 
@@ -887,6 +887,7 @@ static int ifname_map_rtnl_init(struct dl *dl, const char *ifname)
 	err = ifname_map_rtnl_port_parse(dl, ifname, tb[IFLA_DEVLINK_PORT]);
 
 out:
+	free(n);
 	rtnl_close(&rth);
 	return err;
 }
-- 
2.25.1