From: Jim Rees <rees@umich.edu>
Date: Fri, 17 May 2013 21:33:00 +0000 (-0400)
Subject: nfsd: avoid undefined signed overflow
X-Git-Tag: v3.11-rc1~32^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a9357f443d64aa41e9b0dc414953663a6fcca19;p=pandora-kernel.git

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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