linux-kernel - [PATCH 5.11 051/152] net: bonding: fix error return code of bond_neigh

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Message-Id: <20210405085035.941084892@linuxfoundation.org>
Date:   Mon,  5 Apr 2021 10:53:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, TOTE Robot <oslab@...nghua.edu.cn>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 051/152] net: bonding: fix error return code of bond_neigh_init()

From: Jia-Ju Bai <baijiaju1990@...il.com>

[ Upstream commit 2055a99da8a253a357bdfd359b3338ef3375a26c ]

When slave is NULL or slave_ops->ndo_neigh_setup is NULL, no error
return code of bond_neigh_init() is assigned.
To fix this bug, ret is assigned with -EINVAL in these cases.

Fixes: 9e99bfefdbce ("bonding: fix bond_neigh_init()")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/bonding/bond_main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5fe5232cc3f3..fba6b6d1b430 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3917,11 +3917,15 @@ static int bond_neigh_init(struct neighbour *n)
 
 	rcu_read_lock();
 	slave = bond_first_slave_rcu(bond);
-	if (!slave)
+	if (!slave) {
+		ret = -EINVAL;
 		goto out;
+	}
 	slave_ops = slave->dev->netdev_ops;
-	if (!slave_ops->ndo_neigh_setup)
+	if (!slave_ops->ndo_neigh_setup) {
+		ret = -EINVAL;
 		goto out;
+	}
 
 	/* TODO: find another way [1] to implement this.
 	 * Passing a zeroed structure is fragile,
-- 
2.30.1