cli/command/container: ensure channel is allocated

Signed-off-by: Stephen J Day <stephen.day@docker.com> (cherry picked from commit e78772af4d) Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>
2017-09-29 18:14:51 -07:00
parent 328a5917ad
commit 7b99808cac
1 changed files with 4 additions and 1 deletions
@@ -290,8 +290,11 @@ func attachContainer(
 		return nil, errAttach
 	}

+	ch := make(chan error, 1)
+	*errCh = ch
+
 	go func() {
-		*errCh <- func() error {
+		ch <- func() error {
 			streamer := hijackedIOStreamer{
 				streams:      dockerCli,
 				inputStream:  in,