tree 590818d77f07ab18197167024779738ec2a01f12
parent b6040f9706c4c81cc50b50855ed70840f022bebb
author Jim Rees <rees@umich.edu> 1368826380 -0400
committer J. Bruce Fields <bfields@redhat.com> 1369148523 -0400

nfsd: avoid undefined signed overflow

In C, signed integer overflow results in undefined behavior, but unsigned
overflow wraps around. So do the subtraction first, then cast to signed.

Reported-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>