From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: linux-kernel@vger.kernel.org
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Subject: [PATCH 16/18] lib: bitmap: Add missing mask in bitmap_shift_right
Date: Fri, 4 Jul 2014 00:43:02 +0200 [thread overview]
Message-ID: <1404427384-11422-17-git-send-email-linux@rasmusvillemoes.dk> (raw)
In-Reply-To: <1404427384-11422-1-git-send-email-linux@rasmusvillemoes.dk>
There is no guarantee that *src does not contain garbage bits outside
the lower nbits, so we need to mask it before the shift-and-assign.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
include/linux/bitmap.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 2100378..75df61d 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -284,7 +284,7 @@ static inline void bitmap_shift_right(unsigned long *dst,
const unsigned long *src, int n, int nbits)
{
if (small_const_nbits(nbits))
- *dst = *src >> n;
+ *dst = (*src & BITMAP_LAST_WORD_MASK(nbits)) >> n;
else
__bitmap_shift_right(dst, src, n, nbits);
}
--
1.9.2
next prev parent reply other threads:[~2014-07-03 22:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-03 22:42 [PATCH 00/18] lib: bitmap: Various improvements Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 01/18] lib: bitmap: Make nbits parameter of bitmap_empty unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 02/18] lib: bitmap: Make nbits parameter of bitmap_full unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 03/18] lib: bitmap: Make nbits parameter of bitmap_equal unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 04/18] lib: bitmap: Make nbits parameter of bitmap_complement unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 05/18] lib: bitmap: Remove unnecessary mask from bitmap_complement Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 06/18] lib: bitmap: Make nbits parameter of bitmap_{and,or,xor,andnot} unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 07/18] lib: bitmap: Make nbits parameter of bitmap_intersects unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 08/18] lib: bitmap: Make nbits parameter of bitmap_subset unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 09/18] lib: bitmap: Make nbits parameter of bitmap_weight unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 10/18] lib: bitmap: Make the start index of bitmap_set unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 11/18] lib: bitmap: Make the start index of bitmap_clear unsigned Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 12/18] lib: bitmap: Simplify bitmap_parselist Rasmus Villemoes
2014-07-03 22:42 ` [PATCH 13/18] lib: bitmap: Fix typo in kerneldoc for bitmap_pos_to_ord Rasmus Villemoes
2014-07-03 22:43 ` [PATCH 14/18] lib: bitmap: Change parameter of bitmap_*_region to unsigned Rasmus Villemoes
2014-07-03 22:43 ` [PATCH 15/18] lib: bitmap: Micro-optimize bitmap_allocate_region Rasmus Villemoes
2014-07-03 22:43 ` Rasmus Villemoes [this message]
2014-07-03 22:43 ` [PATCH 17/18] lib: bitmap: Add missing mask in bitmap_and Rasmus Villemoes
2014-07-03 22:43 ` [PATCH 18/18] lib: bitmap: Add missing mask in bitmap_andnot Rasmus Villemoes
2014-07-07 23:20 ` [PATCH 00/18] lib: bitmap: Various improvements Andrew Morton
2014-07-07 23:45 ` Joe Perches
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