From fe8d63196478fe3528922ca2b2f4e51612a3e461 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Fri, 5 Jul 2019 14:10:11 +1000
Subject: [PATCH] AP_HAL_SITL: ensure termination of readlink-derived progname

---
 libraries/AP_HAL_SITL/system.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_HAL_SITL/system.cpp b/libraries/AP_HAL_SITL/system.cpp
index 6e82224008..33bee3bdf8 100644
--- a/libraries/AP_HAL_SITL/system.cpp
+++ b/libraries/AP_HAL_SITL/system.cpp
@@ -67,7 +67,11 @@ void dump_stack_trace()
 	char *p;
 	int n;
 
-	n = readlink("/proc/self/exe", progname, sizeof(progname));
+	n = readlink("/proc/self/exe", progname, sizeof(progname)-1);
+	if (n == -1) {
+        strncpy(progname, "unknown", sizeof(progname));
+        n = strlen(progname);
+	}
 	progname[n] = 0;
 
 	p = strrchr(progname, '/');