wc->dirty_bitmap_size is in bytes so must multiply it by 8, not by
BITS_PER_LONG, to get number of bitmap_bits.
Fixes crash in find_next_bit() that was reported:
https://bugzilla.kernel.org/show_bug.cgi?id=200819
Reported-by: edo.rus@gmail.com
Fixes: 48debafe4f2f ("dm: add writecache target")
Cc: stable@vger.kernel.org # 4.18
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
COMPLETION_INITIALIZER_ONSTACK(endio.c),
ATOMIC_INIT(1),
};
- unsigned bitmap_bits = wc->dirty_bitmap_size * BITS_PER_LONG;
+ unsigned bitmap_bits = wc->dirty_bitmap_size * 8;
unsigned i = 0;
while (1) {