diff options
Diffstat (limited to 'kernel/bpf/devmap.c')
| -rw-r--r-- | kernel/bpf/devmap.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 9af048a932b5..d27f3b60ff6d 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -650,19 +650,22 @@ static int __dev_map_hash_update_elem(struct net *net, struct bpf_map *map, u32 ifindex = *(u32 *)value; u32 idx = *(u32 *)key; unsigned long flags; + int err = -EEXIST; if (unlikely(map_flags > BPF_EXIST || !ifindex)) return -EINVAL; + spin_lock_irqsave(&dtab->index_lock, flags); + old_dev = __dev_map_hash_lookup_elem(map, idx); if (old_dev && (map_flags & BPF_NOEXIST)) - return -EEXIST; + goto out_err; dev = __dev_map_alloc_node(net, dtab, ifindex, idx); - if (IS_ERR(dev)) - return PTR_ERR(dev); - - spin_lock_irqsave(&dtab->index_lock, flags); + if (IS_ERR(dev)) { + err = PTR_ERR(dev); + goto out_err; + } if (old_dev) { hlist_del_rcu(&old_dev->index_hlist); @@ -683,6 +686,10 @@ static int __dev_map_hash_update_elem(struct net *net, struct bpf_map *map, call_rcu(&old_dev->rcu, __dev_map_entry_free); return 0; + +out_err: + spin_unlock_irqrestore(&dtab->index_lock, flags); + return err; } static int dev_map_hash_update_elem(struct bpf_map *map, void *key, void *value, |