Messages in this thread Patch in this message | | | Date | Wed, 11 Feb 2015 11:32:30 -0500 | From | Tony Battersby <> | Subject | [PATCH] 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> ---
For inclusion in kernel 3.20.
--- linux-3.19.0/block/blk-mq-tag.c.orig 2015-02-08 21:54:22.000000000 -0500 +++ linux-3.19.0/block/blk-mq-tag.c 2015-02-10 09:42:38.000000000 -0500 @@ -509,6 +509,7 @@ static int bt_alloc(struct blk_mq_bitmap bt->bs = kzalloc(BT_WAIT_QUEUES * sizeof(*bt->bs), GFP_KERNEL); if (!bt->bs) { kfree(bt->map); + bt->map = NULL; return -ENOMEM; }
| |