PR libstdc++/31401 (vstring bits)

2007-04-02  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/31401 (vstring bits)
	* include/ext/vstring.tcc (find(const _CharT*, size_type,
	size_type)): Avoid unsigned overflow.

From-SVN: r123422

libstdc++-v3/ChangeLog

 2007-04-02  Paolo Carlini  <pcarlini@suse.de>
 
+	PR libstdc++/31401 (vstring bits)
+	* include/ext/vstring.tcc (find(const _CharT*, size_type,
+	size_type)): Avoid unsigned overflow.
+
+2007-04-02  Paolo Carlini  <pcarlini@suse.de>
+
 	* include/bits/locale_facets.tcc (num_put<>::do_put(iter_type,
 	ios_base&, char_type, const void*)): Fix for sizeof(const void*)
 	> sizeof(unsigned long).

libstdc++-v3/include/ext/vstring.tcc

@@ -279,7 +279,7 @@ _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
 
       if (__n <= __size)
 	{
-	  for (; __pos + __n <= __size; ++__pos)
+	  for (; __pos <= __size - __n; ++__pos)
 	    if (traits_type::eq(__data[__pos], __s[0])
 		&& traits_type::compare(__data + __pos + 1,
 					__s + 1, __n - 1) == 0)