[Bug c++/79882] New: Lack of bounds checking on -ftemplate-depth argument

["pefoley2 at pefoley dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79882

            Bug ID: 79882
           Summary: Lack of bounds checking on -ftemplate-depth argument
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pefoley2 at pefoley dot com
  Target Milestone: ---

-ftemplate-depth appears to not check for overflow:

 gcc -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/5.4.0/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/5.4.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-5.4.0-r3/work/gcc-5.4.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/5.4.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.4.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.4.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.4.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/include/g++-v5
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/5.4.0/python
--enable-languages=c,c++,go,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 5.4.0-r3 p1.3, pie-0.6.5' --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --enable-libcilkrts
--disable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto --with-isl
--disable-isl-version-check --enable-libsanitizer
Thread model: posix
gcc version 5.4.0 (Gentoo 5.4.0-r3 p1.3, pie-0.6.5)


g++ -std=c++11 -ftemplate-depth=4294967296 a.cc
a.cc: In function ‘int main()’:
a.cc:12:26: fatal error: template instantiation depth exceeds maximum of 0 (use
-ftemplate-depth= to increase the maximum)

g++ -std=c++11 -ftemplate-depth=4294967297 a.cc
a.cc: In instantiation of ‘struct meme<2147483648u, int>’:
a.cc:12:26:   required from here
a.cc:3:20: fatal error: template instantiation depth exceeds maximum of 1 (use
-ftemplate-depth= to increase the maximum)