[PATCH bpf 1/2] bpf: queue/stack map, fix return value of map_lookup_elem

[Prashant Bhole]

Since commit 509db2833e0d ("bpf: error handling when map_lookup_elem
isn't supported") when map lookup isn't supported, the map_lookup_elem
function should return ERR_PTR(-EOPNOTSUPP).

Fixes: f1a2e44a3aec ("bpf: add queue and stack maps")
Signed-off-by: Prashant Bhole <bhole_prashant...@lab.ntt.co.jp>
---
 kernel/bpf/queue_stack_maps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/queue_stack_maps.c b/kernel/bpf/queue_stack_maps.c
index b384ea9f3254..8fd19b06da66 100644
--- a/kernel/bpf/queue_stack_maps.c
+++ b/kernel/bpf/queue_stack_maps.c
@@ -240,7 +240,7 @@ static int queue_stack_map_push_elem(struct bpf_map *map, 
void *value,
 /* Called from syscall or from eBPF program */
 static void *queue_stack_map_lookup_elem(struct bpf_map *map, void *key)
 {
-       return NULL;
+       return ERR_PTR(-EOPNOTSUPP);
 }
 
 /* Called from syscall or from eBPF program */
-- 
2.17.2