1 files changed, 13 insertions, 2 deletions

diff --git a/samples/bpf/test_maps.c b/samples/bpf/test_maps.c
index 47bf0858f9e4..cce2b59751eb 100644
--- a/samples/bpf/test_maps.c
+++ b/samples/bpf/test_maps.c
@@ -68,7 +68,16 @@ static void test_hashmap_sanity(int i, void *data)
         assert(bpf_update_elem(map_fd, &key, &value, BPF_NOEXIST) == -1 &&
                errno == E2BIG);
 
+        /* update existing element, thought the map is full */
+        key = 1;
+        assert(bpf_update_elem(map_fd, &key, &value, BPF_EXIST) == 0);
+        key = 2;
+        assert(bpf_update_elem(map_fd, &key, &value, BPF_ANY) == 0);
+        key = 1;
+        assert(bpf_update_elem(map_fd, &key, &value, BPF_ANY) == 0);
+
         /* check that key = 0 doesn't exist */
+        key = 0;
         assert(bpf_delete_elem(map_fd, &key) == -1 && errno == ENOENT);
 
         /* iterate over two elements */
@@ -413,10 +422,12 @@ static void do_work(int fn, void *data)
 
         for (i = fn; i < MAP_SIZE; i += TASKS) {
                 key = value = i;
-                if (do_update)
+                if (do_update) {
                         assert(bpf_update_elem(map_fd, &key, &value, BPF_NOEXIST) == 0);
-                else
+                        assert(bpf_update_elem(map_fd, &key, &value, BPF_EXIST) == 0);
+                } else {
                         assert(bpf_delete_elem(map_fd, &key) == 0);
+                }
         }
 }