bpf: bpf_prog_array_copy() should return -ENOENT if exclude_prog not found
This makes is it possible for bpf prog detach to return -ENOENT.
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 81fdf2f..af1486d 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1006,6 +1006,8 @@ void perf_event_detach_bpf_prog(struct perf_event *event)
old_array = event->tp_event->prog_array;
ret = bpf_prog_array_copy(old_array, event->prog, NULL, &new_array);
+ if (ret == -ENOENT)
+ goto unlock;
if (ret < 0) {
bpf_prog_array_delete_safe(old_array, event->prog);
} else {
