From: Scott Wood <scottwood@freescale.com>
Date: Fri, 22 Nov 2013 00:26:42 +0000 (-0600)
Subject: powerpc/booke: Only check for hugetlb in flush if vma != NULL
X-Git-Tag: v3.13-rc2~23^2~6^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d742aa152f27448d39ce65fb829e396d10cd63a9;p=pandora-kernel.git

powerpc/booke: Only check for hugetlb in flush if vma != NULL

And in flush_hugetlb_page(), don't check whether vma is NULL after
we've already dereferenced it.

This was found by Dan using static analysis as described here:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-November/113161.html

We currently get away with this because the callers that currently pass
NULL for vma seem to be 32-bit-only (e.g. highmem, and
CONFIG_DEBUG_PGALLOC in pgtable_32.c)  Hugetlb is currently 64-bit only,
so we never saw a NULL vma here.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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