netdev - [PATCH AUTOSEL 5.15 07/47] bonding: return -ENOMEM instead of BUG in alb_upper_dev

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Date: Tue, 16 Jan 2024 14:57:10 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Zhengchao Shao <shaozhengchao@...wei.com>,
	Jay Vosburgh <jay.vosburgh@...onical.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	j.vosburgh@...il.com,
	andy@...yhouse.net,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 07/47] bonding: return -ENOMEM instead of BUG in alb_upper_dev_walk

From: Zhengchao Shao <shaozhengchao@...wei.com>

[ Upstream commit d6b83f1e3707c4d60acfa58afd3515e17e5d5384 ]

If failed to allocate "tags" or could not find the final upper device from
start_dev's upper list in bond_verify_device_path(), only the loopback
detection of the current upper device should be affected, and the system is
no need to be panic.
So return -ENOMEM in alb_upper_dev_walk to stop walking, print some warn
information when failed to allocate memory for vlan tags in
bond_verify_device_path.

I also think that the following function calls
netdev_walk_all_upper_dev_rcu
---->>>alb_upper_dev_walk
---------->>>bond_verify_device_path
>From this way, "end device" can eventually be obtained from "start device"
in bond_verify_device_path, IS_ERR(tags) could be instead of
IS_ERR_OR_NULL(tags) in alb_upper_dev_walk.

Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
Acked-by: Jay Vosburgh <jay.vosburgh@...onical.com>
Link: https://lore.kernel.org/r/20231118081653.1481260-1-shaozhengchao@huawei.com
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/bonding/bond_alb.c  | 3 ++-
 drivers/net/bonding/bond_main.c | 5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index b29393831a30..7091b018078b 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -973,7 +973,8 @@ static int alb_upper_dev_walk(struct net_device *upper,
 	if (netif_is_macvlan(upper) && !strict_match) {
 		tags = bond_verify_device_path(bond->dev, upper, 0);
 		if (IS_ERR_OR_NULL(tags))
-			BUG();
+			return -ENOMEM;
+
 		alb_send_lp_vid(slave, upper->dev_addr,
 				tags[0].vlan_proto, tags[0].vlan_id);
 		kfree(tags);
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 9aed194d308d..1ecd0c136fc6 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2893,8 +2893,11 @@ struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 
 	if (start_dev == end_dev) {
 		tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
-		if (!tags)
+		if (!tags) {
+			net_err_ratelimited("%s: %s: Failed to allocate tags\n",
+					    __func__, start_dev->name);
 			return ERR_PTR(-ENOMEM);
+		}
 		tags[level].vlan_proto = VLAN_N_VID;
 		return tags;
 	}
-- 
2.43.0