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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, TOTE Robot <oslab@tsinghua.edu.cn>,
        Jia-Ju Bai <baijiaju1990@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 108/157] net: bonding: fix error return code of bond_neigh_init()
Date:   Mon, 22 Mar 2021 13:27:45 +0100
Message-Id: <20210322121937.193932219@linuxfoundation.org>
In-Reply-To: <20210322121933.746237845@linuxfoundation.org>
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From: Jia-Ju Bai <baijiaju1990@gmail.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@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.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 47afc5938c26..6d5a39af1097 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3918,11 +3918,15 @@ 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