[patch 19/29] x86: fix off-by-one in find_next_zero_string

Greg Kroah-Hartman
2007-11-20T18:34:17Z

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2.6.23-stable review patch. If anyone has any objections, please let us
know.

------------------
From: Andrew Hastings <abh@cray.com>

patch 801916c1b369b637ce799e6c71a94963ff63df79 in mainline.

x86: fix off-by-one in find_next_zero_string

Fix an off-by-one error in find_next_zero_string which prevents
allocating the last bit.

[ tglx: arch/x86 adaptation ]

Signed-off-by: Andrew Hastings <abh@cray.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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

--- a/arch/x86_64/lib/bitstr.c
+++ b/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)) {

--