This patch fixes a crash in find_next_bit reported in https://bugzilla.kernel.org/show_bug.cgi?id=200819 . wc->dirty_bitmap_size is in bytes, so we must multiply it by 8, not by BITS_PER_LONG. Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # 4.18+ Fixes: 48debafe4f2f ("dm: add writecache target") --- drivers/md/dm-writecache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6/drivers/md/dm-writecache.c =================================================================== --- linux-2.6.orig/drivers/md/dm-writecache.c 2018-08-13 16:52:31.000000000 +0200 +++ linux-2.6/drivers/md/dm-writecache.c 2018-08-16 18:06:35.000000000 +0200 @@ -457,7 +457,7 @@ static void ssd_commit_flushed(struct dm 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) { -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
