thorpej e98c5a9b1c Fix two boundary/overflow errors in extent_alloc_subregion():
(1): "substart == ex->ex_end" and "subend == ex->ex_start"
     are completely legal parameters for extent_alloc_subregion()
(2): "(subend - substart) + 1" can cause an overflow if the whole
    numeric range is covered by the extent.
Submitted by Matthias Drochner <drochner@zelz26.zel.kfa-juelich.de>
in PR #3119.
1997-05-12 23:36:32 +00:00
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