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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@123422 138bc75d-0d04-0410-961f-82ee72b054a4

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,

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)