linux-kernel - [PATCH 06/25] x86: check range in update range

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Message-id: <1261525263-13763-7-git-send-email-yinghai@kernel.org>
Date:	Tue, 22 Dec 2009 15:40:44 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 06/25] x86: check range in update range

fend off wrong range

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 kernel/range.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/range.c b/kernel/range.c
index 46a10c8..71e0021 100644
--- a/kernel/range.c
+++ b/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 *range, int az, int nr_range,
 {
 	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 az, u64 start, u64 end)
 {
 	int i, j;
 
+	if (start > end)
+		return;
+
 	for (j = 0; j < az; j++) {
 		if (!range[j].end)
 			continue;
-- 
1.6.0.2

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