From: Xi Wang <xi.wang@gmail.com>
Date: Thu, 16 Feb 2012 16:56:29 +0000 (-0500)
Subject: ceph: fix overflow check in build_snap_context()
X-Git-Tag: v3.2.64~243
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce4ded58d4b5869153cf5fde839161dff974cf94;p=pandora-kernel.git

ceph: fix overflow check in build_snap_context()

commit 80834312a4da1405a9bc788313c67643de6fcb4c upstream.

The overflow check for a + n * b should be (n > (ULONG_MAX - a) / b),
rather than (n > ULONG_MAX / b - a).

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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