From: Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 31 Mar 2009 03:55:23 +0000 (-0600)
Subject: lguest: fix spurious BUG_ON() on invalid guest stack.
X-Git-Tag: v2.6.30-rc1~605^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6afbdd059c27330eccbd85943354f94c2b83a7fe;p=pandora-kernel.git

lguest: fix spurious BUG_ON() on invalid guest stack.

Impact: fix crash on misbehaving guest

gpte_addr() contains a BUG_ON(), insisting that the present flag is
set.  We need to return before we call it if that isn't the case.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
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