summaryrefslogtreecommitdiff
path: root/include/linux/bitmap.h
diff options
context:
space:
mode:
authorRasmus Villemoes <linux@rasmusvillemoes.dk>2014-08-07 03:10:20 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-07 05:01:27 +0400
commitc5341ec8904ebff50f365a2626da6ab525d63b9e (patch)
tree0acb8e7d30405e97097d226a8f4d558470e408fe /include/linux/bitmap.h
parent2ac521d3325a24f01c1f1e86c74537b831d282c5 (diff)
downloadlinux-c5341ec8904ebff50f365a2626da6ab525d63b9e.tar.xz
lib: bitmap: add missing mask in bitmap_shift_right
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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/bitmap.h')
-rw-r--r--include/linux/bitmap.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 210037833356..75df61d9ecfb 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);
}