Fix buffer overflow in DateLUT#19472
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Backport #19472 to 20.12: Fix buffer overflow in DateLUT
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Backport #19472 to 20.11: Fix buffer overflow in DateLUT
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Backport #19472 to 20.10: Fix buffer overflow in DateLUT
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Backport #19472 to 21.1: Fix buffer overflow in DateLUT
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Backport #19472 to 20.8: Fix buffer overflow in DateLUT
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Buffer overflow (on memory read) was possible if
addMonthfunction was called with specifically crafted arguments. This fixes #19441. This fixes #19413.