4.19-stable review patch. If anyone has any objections, please let me know.
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From: Zhengchao Shao shaozhengchao@huawei.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@huawei.com Acked-by: Jay Vosburgh jay.vosburgh@canonical.com Link: https://lore.kernel.org/r/20231118081653.1481260-1-shaozhengchao@huawei.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.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 e03f4883858a..5947c1305527 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -984,7 +984,8 @@ static int alb_upper_dev_walk(struct net_device *upper, void *_data) 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 79b36f1c50ae..920b491bd4cd 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2460,8 +2460,11 @@ 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; }