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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/114359] std::binomial_distribution hangs in infinite
 loop
Date: Tue, 19 Mar 2024 16:00:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114359

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:07e03761a7fc1626a6a74ed957e117f56981558c

commit r14-9551-g07e03761a7fc1626a6a74ed957e117f56981558c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Mar 18 13:22:17 2024 +0000

    libstdc++: Fix infinite loop in std::binomial_distribution [PR114359]

    The multiplication (4 * _M_t * __1p) can wraparound to zero if _M_t is
    unsigned and 4 * _M_t wraps to zero. The third operand has type double,
    so do the second multiplication first, so that we aren't multiplying
    integers.

    libstdc++-v3/ChangeLog:

            PR libstdc++/114359
            * include/bits/random.tcc (binomial_distribution::param_type):
            Ensure arithmetic is done as type double.
            * testsuite/26_numerics/random/binomial_distribution/114359.cc:=
 New
test.=