PR 51090 Check that getenv result != NULL before proceeding.

2011-11-11  Janne Blomqvist  <jb@gcc.gnu.org>

	PR libfortran/51090
	* runtime/main.c (find_addr2line): NULL check before proceeding.

From-SVN: r181288

libgfortran/ChangeLog

@@ -1,3 +1,8 @@
+2011-11-11  Janne Blomqvist  <jb@gcc.gnu.org>
+
+	PR libfortran/51090
+	* runtime/main.c (find_addr2line): NULL check before proceeding.
+
 2011-11-10  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	* intrinsics/cpu_time.c (__cpu_time_1): Don't force inlining.

libgfortran/runtime/main.c

@@ -149,6 +149,8 @@ find_addr2line (void)
 #ifdef HAVE_ACCESS
 #define A2L_LEN 10
   char *path = getenv ("PATH");
+  if (!path)
+      return;
   size_t n = strlen (path);
   char ap[n + 1 + A2L_LEN];
   size_t ai = 0;