[Bug 272474] lib/libc: bcmp may give wrong results on LP64 systems

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272474

--- Comment #6 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=3b0dacf6fd13cf8688402561192899507f46c276

commit 3b0dacf6fd13cf8688402561192899507f46c276
Author:     Robert Clausecker <fuz@FreeBSD.org>
AuthorDate: 2023-07-12 18:23:21 +0000
Commit:     Robert Clausecker <fuz@FreeBSD.org>
CommitDate: 2023-07-21 08:54:08 +0000

    lib/libc/string/bcmp.c: fix integer overflow bug

    bcmp() returned the number of remaining bytes when the main loop exits.
    In case of a match, this is zero, else a positive integer.  On systems
    where SIZE_MAX > INT_MAX, the implicit conversion from size_t to int in
    the return value may cause the number of remaining bytes to overflow,
    becoming zero and falsely indicating a successful comparison.

    Fix the bug by always returning 0 on equality, 1 otherwise.

    PR:             272474
    Approved by:    emaste
    Reviewed by:    imp
    MFC After:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D41011

    (cherry picked from commit 4da7282a1882fc03c99591c27d44a2e6dfda364b)

 lib/libc/string/bcmp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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