[Bug libstdc++/78236] regex_iterator constructor is incomplete and creates uninitialized values that may be used

[christophe.monat at st dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78236

--- Comment #1 from Christophe Monat <christophe.monat at st dot com> ---
Comment on attachment 39982
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39982
Proposed patch to fix the regex_iterator constructor

>diff --git a/libstdc++-v3/include/bits/regex.h b/libstdc++-v3/include/bits/regex.h
>index a7d45e6..bb0a167 100644
>--- a/libstdc++-v3/include/bits/regex.h
>+++ b/libstdc++-v3/include/bits/regex.h
>@@ -2454,7 +2454,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
>        * one-past-the-end of a range.
>        */
>       regex_iterator()
>-      : _M_match()
>+      : _M_pregex(), _M_flags(regex_constants::match_default), _M_match()
>       { }
> 
>       /**