re PR fortran/47296 (I/O Segfault when running out of file descriptors)

2011-01-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/47296
	* io/unix.c (unpack_filename): Return non-zero if the filename passed
	in is NULL.

From-SVN: r168832

libgfortran/ChangeLog

+2011-01-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR libgfortran/47296
+	* io/unix.c (unpack_filename): Return non-zero if the filename passed
+	in is NULL.
+
 2011-01-04  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/47154

libgfortran/io/unix.c

@@ -1000,6 +1000,8 @@ unit_to_fd (int unit)
 int
 unpack_filename (char *cstring, const char *fstring, int len)
 {
+  if (fstring == NULL)
+    return 1;
   len = fstrlen (fstring, len);
   if (len >= PATH_MAX)
     return 1;