[PATCH 1/4] rt-tests: cyclicdeadline: fix segmentation fault on close

[Kurt Kanzenbach <kurt@linutronix.de>]

The current code generates a segmentation fault in the last free() call.

  $ sudo ./cyclicdeadline
  Using all CPUS
  /sys/kernel/debug/sched_features: Success
  interval: 600:1000
    Tested at 5us of 600us
  deadline thread 2963
  thread[2963] runtime=600us deadline=1000us
  main thread 2962
  fail 2 0
  T: 0 ( 2963) I:1000 C:   1268 Min:      7 Act:   55 Avg:   56 Max:     256
  [1]    2961 segmentation fault  sudo ./cyclicdeadline

This is caused by a buffer overflow in setup_ftrace_marker(). The appended
string is 21 not 14 characters wide. Fix it by using strlen() like the other
function do.

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
---
 src/sched_deadline/cyclicdeadline.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sched_deadline/cyclicdeadline.c b/src/sched_deadline/cyclicdeadline.c
index 08460107c464..303b5e96647a 100644
--- a/src/sched_deadline/cyclicdeadline.c
+++ b/src/sched_deadline/cyclicdeadline.c
@@ -283,7 +283,7 @@ static void setup_ftrace_marker(void)
 {
 	struct stat st;
 	const char *debugfs = find_debugfs();
-	char files[strlen(debugfs) + 14];
+	char files[strlen(debugfs) + strlen("/tracing/trace_marker") + 1];
 	int ret;
 
 	if (strlen(debugfs) == 0)
-- 
2.11.0