From: Xi Wang <xi.wang@gmail.com>
Date: Thu, 16 Feb 2012 16:55:48 +0000 (-0500)
Subject: libceph: fix overflow check in crush_decode()
X-Git-Tag: v3.4-rc1~76^2~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64486697771cbe219fffcb5c8e2ed9ca4fdf086c;p=pandora-kernel.git

libceph: fix overflow check in crush_decode()

The existing overflow check (n > ULONG_MAX / b) didn't work, because
n = ULONG_MAX / b would both bypass the check and still overflow the
allocation size a + n * b.

The correct check should be (n > (ULONG_MAX - a) / b).

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
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