Merge ssh://tahini.csx.cam.ac.uk/home/git/exim

1 files changed, 3 insertions, 1 deletions

diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c
index fb55ae01b..41796a4d9 100644
--- a/src/src/transports/smtp.c
+++ b/src/src/transports/smtp.c
@@ -1078,10 +1078,12 @@ if (tls_offered && !suppress_tls &&
   if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
       ob->command_timeout))
     {
-    Ustrncpy(buffer, buffer2, sizeof(buffer));
     if (errno != 0 || buffer2[0] == 0 ||
          (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
+      {
+      Ustrncpy(buffer, buffer2, sizeof(buffer));
       goto RESPONSE_FAILED;
+      }
     }
 
   /* STARTTLS accepted: try to negotiate a TLS session. */