fix a data-race in the mock net

This was causing ipfs/kubo#5637 (comment)
libp2p · Oct 24, 2018 · 841a627 · 841a627
1 parent 30e4db2
commit 841a627
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/p2p/net/mock/mock_stream.go b/p2p/net/mock/mock_stream.go
@@ -56,6 +56,11 @@ func (s *stream) Write(p []byte) (n int, err error) {
 	l := s.conn.link
 	delay := l.GetLatency() + l.RateLimit(len(p))
 	t := time.Now().Add(delay)
+
+	// Copy it.
+	cpy := make([]byte, len(p))
+	copy(cpy, p)
+
 	select {
 	case <-s.closed: // bail out if we're closing.
 		return 0, s.writeErr