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git2svn
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svn:date
V 27
2021-10-04T14:19:03.601063Z
K 7
svn:log
V 621
rman: fix overflow in rman_reserve_resource_bound()

If the default range of [0, ~0] is given, then (~0 - 0) + 1 == 0. This
in turn will cause any allocation of non-zero size to fail. Zero-sized
allocations are prohibited, so add a KASSERT to this effect.

History indicates it is part of the original rman code.  This bug may in
fact be older than some contributors.

Reviewed by:	mhorne
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D30280

(cherry picked from commit bcddaadbef5850ed9f040836d3f25ff57138ae28)

Git Hash:   a3acb379bdea033ce08b4800cbb5a9c46a673ce1
Git Author: ehem+freebsd@m5p.com
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