From 99c014a87979c9244806685f3c3fc7767f79f645 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Date: Wed, 8 Mar 2017 10:16:17 -0500
Subject: [PATCH] ktest: Fix while loop in wait_for_input
The run_command function was changed to use the wait_for_input function to
allow having a timeout if the command to run takes too much time. There was
a bug in the wait_for_input where it could end up going into an infinite
loop. There's two issues here. One is that the return value of the sysread
wasn't used for the write (to write a proper size), and that it should
continue processing the passed in file descriptor too even if there was
input. There was no check for error, if for some reason STDIN returned an
error, the function would go into an infinite loop and never exit.
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixes: 6e98d1b4415f ("ktest: Add timeout to ssh command")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
tools/testing/ktest/ktest.pl | 7 ++++---
1 file 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
--
GitLab