Commit c5341ec8 authored Aug 06, 2014 by Rasmus Villemoes Committed by Linus Torvalds Aug 06, 2014

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>

parent 2ac521d3

include/linux/bitmap.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}