From 91e6796b923cfac0d8d334115a0ef10db8c45995 Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Tue, 20 Mar 2018 12:09:13 +0100
Subject: [PATCH] Set_program_directory(): check return value of readlink()

---
 src/setup.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/setup.c b/src/setup.c
index 14c6b92d..e9b4c24a 100644
--- a/src/setup.c
+++ b/src/setup.c
@@ -106,9 +106,11 @@ void Set_program_directory(const char * argv0, char * program_dir)
   if (argv0[0]!='/')
   {
     char path[PATH_MAX];
-    readlink("/proc/self/exe", path, sizeof(path));
-    Extract_path(program_dir, path);
-    return;
+    if (readlink("/proc/self/exe", path, sizeof(path)) >= 0)
+    {
+      Extract_path(program_dir, path);
+      return;
+    }
   }  
   Extract_path(program_dir, argv0);