[PATCH] bpf: fix range_tree_set error handling

[Soma Nakata]

`range_tree_set` might fail and return -ENOMEM,
causing subsequent `bpf_arena_alloc_pages` to fail.
Added the error handling.

Signed-off-by: Soma Nakata <soma.nakata@xxxxxxxxxxxxxxxxxxx>
---
 kernel/bpf/arena.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c
index 41a76ca56040..4b22a651b5d5 100644
--- a/kernel/bpf/arena.c
+++ b/kernel/bpf/arena.c
@@ -138,7 +138,11 @@ static struct bpf_map *arena_map_alloc(union bpf_attr *attr)
 	INIT_LIST_HEAD(&arena->vma_list);
 	bpf_map_init_from_attr(&arena->map, attr);
 	range_tree_init(&arena->rt);
-	range_tree_set(&arena->rt, 0, attr->max_entries);
+	err = range_tree_set(&arena->rt, 0, attr->max_entries);
+	if (err) {
+		bpf_map_area_free(arena);
+		goto err;
+	}
 	mutex_init(&arena->lock);
 
 	return &arena->map;
-- 
2.47.1