tree c05956de6d4221f4ce5935902cab4598e7d3a171
parent 854fbb9c699e34fe4889e6907c4fc73889192223
author Tony Battersby <tonyb@cybernetics.com> 1423672350 -0500
committer Jens Axboe <axboe@fb.com> 1423672521 -0700

blk-mq: fix double-free in error path

If the allocation of bt->bs fails, then bt->map can be freed twice, once
in blk_mq_init_bitmap_tags() -> bt_alloc(), and once in
blk_mq_init_bitmap_tags() -> bt_free().  Fix by setting the pointer to
NULL after the first free.

Cc: <stable@vger.kernel.org>
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Jens Axboe <axboe@fb.com>