Rick Macklem a5f9fe2bab copy_file_range(2): Fix for small values of input file offset and len
r366302 broke copy_file_range(2) for small values of
input file offset and len.

It was possible for rem to be greater than len and then
"len - rem" was a large value, since both variables are
unsigned.

Reported by: koobs, Pablo <pablogsal gmail com> (Python)
Reviewed by:	asomers, koobs
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D28981
2021-03-01 06:31:10 -08:00
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