[Bug libstdc++/111102] illegal pointer arithmetic invoked by std::format("L{:65536}",1)

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111102

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jonathan Wakely
<r...@gcc.gnu.org>:

https://gcc.gnu.org/g:183eea6029be2f6c9f416d6ffe751c469237ff2d

commit r13-7916-g183eea6029be2f6c9f416d6ffe751c469237ff2d
Author: Paul Dreik <gccpatc...@pauldreik.se>
Date:   Thu Aug 24 11:43:43 2023 +0100

    libstdc++: fix illegal pointer arithmetic in format [PR111102]

    When parsing a format string, the width is parsed into an unsigned short
    but the result is not checked in the case the format string is not a
    char string (such as a wide string). In case the parse fails, a null
    pointer is returned which is used for pointer arithmetic which is
    undefined behaviour.

    Signed-off-by: Paul Dreik <gccpatc...@pauldreik.se>

    libstdc++-v3/ChangeLog:

            PR libstdc++/111102
            * include/std/format (__format::__parse_integer): Check for
            non-null pointer.

    (cherry picked from commit dd4bdb9eea436bf06f175d8dbfc2190377455be4)