linux-kernel - [PATCH] [38/50] x86_64: fix off-by-one in find_next_zero

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Message-Id: <20070921223238.450611479D@wotan.suse.de>
Date:	Sat, 22 Sep 2007 00:32:38 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	abh@...y.com, patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [38/50] x86_64: fix off-by-one in find_next_zero_string


From: Andrew Hastings <abh@...y.com>
Fix an off-by-one error in find_next_zero_string which prevents
allocating the last bit.

Signed-off-by: Andrew Hastings <abh@...y.com> on behalf of Cray Inc.
Signed-off-by: Andi Kleen <ak@...e.de>

---
 arch/x86_64/lib/bitstr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/arch/x86_64/lib/bitstr.c
===================================================================
--- linux.orig/arch/x86_64/lib/bitstr.c
+++ linux/arch/x86_64/lib/bitstr.c
@@ -14,7 +14,7 @@ find_next_zero_string(unsigned long *bit
 	
 	/* could test bitsliced, but it's hardly worth it */
 	end = n+len;
-	if (end >= nbits) 
+	if (end > nbits)
 		return -1; 
 	for (i = n+1; i < end; i++) { 
 		if (test_bit(i, bitmap)) {  
-
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