From 1a9357f443d64aa41e9b0dc414953663a6fcca19 Mon Sep 17 00:00:00 2001
From: Jim Rees <rees@umich.edu>
Date: Fri, 17 May 2013 17:33:00 -0400
Subject: [PATCH] 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>
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Reading git-format-patch failed