From 564e559f2baf6a868768d0cac286980b3cfd6e30 Mon Sep 17 00:00:00 2001 From: Tony Battersby Date: Wed, 11 Feb 2015 11:32:30 -0500 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: Signed-off-by: Tony Battersby Signed-off-by: Jens Axboe --- block/blk-mq-tag.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index e3387a74a9a2..d53a764b05ea 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -524,6 +524,7 @@ static int bt_alloc(struct blk_mq_bitmap_tags *bt, unsigned int depth, bt->bs = kzalloc(BT_WAIT_QUEUES * sizeof(*bt->bs), GFP_KERNEL); if (!bt->bs) { kfree(bt->map); + bt->map = NULL; return -ENOMEM; }