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-rw-r--r--kernel/bpf/lpm_trie.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c
index b5e281a55760..be5bf0389532 100644
--- a/kernel/bpf/lpm_trie.c
+++ b/kernel/bpf/lpm_trie.c
@@ -375,6 +375,10 @@ static long trie_update_elem(struct bpf_map *map,
* simply assign the @new_node to that slot and be done.
*/
if (!node) {
+ if (flags == BPF_EXIST) {
+ ret = -ENOENT;
+ goto out;
+ }
rcu_assign_pointer(*slot, new_node);
goto out;
}
@@ -383,18 +387,31 @@ static long trie_update_elem(struct bpf_map *map,
* which already has the correct data array set.
*/
if (node->prefixlen == matchlen) {
+ if (!(node->flags & LPM_TREE_NODE_FLAG_IM)) {
+ if (flags == BPF_NOEXIST) {
+ ret = -EEXIST;
+ goto out;
+ }
+ trie->n_entries--;
+ } else if (flags == BPF_EXIST) {
+ ret = -ENOENT;
+ goto out;
+ }
+
new_node->child[0] = node->child[0];
new_node->child[1] = node->child[1];
- if (!(node->flags & LPM_TREE_NODE_FLAG_IM))
- trie->n_entries--;
-
rcu_assign_pointer(*slot, new_node);
free_node = node;
goto out;
}
+ if (flags == BPF_EXIST) {
+ ret = -ENOENT;
+ goto out;
+ }
+
/* If the new node matches the prefix completely, it must be inserted
* as an ancestor. Simply insert it between @node and *@slot.
*/