linux-kernel - Re: [PATCH 2/8] bitmap: Introduce bitmap_set, bitmap_clear, bitmap_find_next_zero

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Message-ID: <20091013091017.GA18431@localhost.localdomain>
Date:	Tue, 13 Oct 2009 18:10:17 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Lothar Wassmann <LW@...O-electronics.de>,
	linux-usb@...r.kernel.org, Roland Dreier <rolandd@...co.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.co.il>,
	netdev@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org,
	linux-altix@....com
Subject: Re: [PATCH 2/8] bitmap: Introduce bitmap_set, bitmap_clear,
	bitmap_find_next_zero_area

My user space testing exposed off-by-one error find_next_zero_area
in iommu-helper. Some zero area cannot be found by this bug.

Subject: [PATCH] Fix off-by-one error in find_next_zero_area

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
---
 lib/iommu-helper.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 75dbda0..afc58bc 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -19,7 +19,7 @@ again:
 	index = (index + align_mask) & ~align_mask;
 
 	end = index + nr;
-	if (end >= size)
+	if (end > size)
 		return -1;
 	for (i = index; i < end; i++) {
 		if (test_bit(i, map)) {
-- 
1.5.4.3

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