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Message-ID: <4B2B4F93.2080203@kernel.org>
Date: Fri, 18 Dec 2009 01:46:59 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/9] x86: check range in update range
fend off wrong range
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
kernel/range.c | 9 +++++++++
1 file changed, 9 insertions(+)
Index: linux-2.6/kernel/range.c
===================================================================
--- linux-2.6.orig/kernel/range.c
+++ linux-2.6/kernel/range.c
@@ -13,6 +13,9 @@
int add_range(struct range *range, int az, int nr_range, u64 start, u64 end)
{
+ if (start > end)
+ return nr_range;
+
/* Out of slots: */
if (nr_range >= az)
return nr_range;
@@ -30,6 +33,9 @@ int add_range_with_merge(struct range *r
{
int i;
+ if (start > end)
+ return nr_range;
+
/* Try to merge it with old one: */
for (i = 0; i < nr_range; i++) {
u64 final_start, final_end;
@@ -59,6 +65,9 @@ void subtract_range(struct range *range,
{
int i, j;
+ if (start > end)
+ return;
+
for (j = 0; j < az; j++) {
if (!range[j].end)
continue;
--
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