1 files changed, 4 insertions, 3 deletions

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 29470b554711..0c006a2f165d 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -1904,11 +1904,12 @@ sub wait_for_input
 
         # copy data from stdin to the console
         if (vec($rout, fileno(\*STDIN), 1) == 1) {
-            sysread(\*STDIN, $buf, 1000);
-            syswrite($fp, $buf, 1000);
-            next;
+            $nr = sysread(\*STDIN, $buf, 1000);
+            syswrite($fp, $buf, $nr) if ($nr > 0);
         }
 
+        next if (vec($rout, fileno($fp), 1) != 1);
+
         $line = "";
 
         # try to read one char at a time