Fix SIGFPE on shuffling for 0

2019-05-09 12:01:01 +02:00 · 2019-05-09 12:01:01 +02:00 · 8cfbfdf565
parent d7d594eee9
commit 8cfbfdf565
1 changed files with 5 additions and 0 deletions
--- a/beacon_chain/spec/validator.nim
+++ b/beacon_chain/spec/validator.nim
@ -25,6 +25,11 @@ func get_shuffled_seq*(seed: Eth2Digest,
  ##
  ## Invert the inner/outer loops from the spec, essentially. Most useful
  ## hash result re-use occurs within a round.
+
+  # Empty size -> empty list.
+  if list_size == 0:
+    return
+
  var
    # Share these buffers.
    pivot_buffer: array[(32+1), byte]