[Bug 195436] New: patch utility, line number overflows checks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195436

            Bug ID: 195436
           Summary: patch utility, line number overflows checks
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: david.carlier at hardenedbsd.org

Created attachment 149926
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149926&action=edit
Proposed patch

Inspired by OpenBSD's version. it does some overflow checks in case line
numbers are beyond of LONG_MAX limits and such.

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