Merge tag 'block-6.2-2023-02-03' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:
 "A bit bigger than I'd like at this point, but mostly a bunch of little
  fixes. In detail:

   - NVMe pull request via Christoph:
       - Fix a missing queue put in nvmet_fc_ls_create_association
         (Amit Engel)
       - Clear queue pointers on tag_set initialization failure
         (Maurizio Lombardi)
       - Use workqueue dedicated to authentication (Shin'ichiro
         Kawasaki)

   - Fix for an overflow in ublk (Liu)

   - Fix for leaking a queue reference in block cgroups (Ming)

   - Fix for a use-after-free in BFQ (Yu)"

* tag 'block-6.2-2023-02-03' of git://git.kernel.dk/linux:
  blk-cgroup: don't update io stat for root cgroup
  nvme-auth: use workqueue dedicated to authentication
  nvme: clear the request_queue pointers on failure in nvme_alloc_io_tag_set
  nvme: clear the request_queue pointers on failure in nvme_alloc_admin_tag_set
  nvme-fc: fix a missing queue put in nvmet_fc_ls_create_association
  block: Fix the blk_mq_destroy_queue() documentation
  block: ublk: extending queue_size to fix overflow
  block, bfq: fix uaf for bfqq in bic_set_bfqq()

3 files changed, 19 insertions, 4 deletions

diff --git a/drivers/nvme/host/auth.c b/drivers/nvme/host/auth.c
index 4424f53a8a0a..b57630d1d3b8 100644
--- a/drivers/nvme/host/auth.c
+++ b/drivers/nvme/host/auth.c
@@ -45,6 +45,8 @@ struct nvme_dhchap_queue_context {
 	int sess_key_len;
 };
 
+struct workqueue_struct *nvme_auth_wq;
+
 #define nvme_auth_flags_from_qid(qid) \
 	(qid == 0) ? 0 : BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED
 #define nvme_auth_queue_from_qid(ctrl, qid) \
@@ -866,7 +868,7 @@ int nvme_auth_negotiate(struct nvme_ctrl *ctrl, int qid)
 
 	chap = &ctrl->dhchap_ctxs[qid];
 	cancel_work_sync(&chap->auth_work);
-	queue_work(nvme_wq, &chap->auth_work);
+	queue_work(nvme_auth_wq, &chap->auth_work);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nvme_auth_negotiate);
@@ -1008,10 +1010,15 @@ EXPORT_SYMBOL_GPL(nvme_auth_free);
 
 int __init nvme_init_auth(void)
 {
+	nvme_auth_wq = alloc_workqueue("nvme-auth-wq",
+			       WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
+	if (!nvme_auth_wq)
+		return -ENOMEM;
+
 	nvme_chap_buf_cache = kmem_cache_create("nvme-chap-buf-cache",
 				CHAP_BUF_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL);
 	if (!nvme_chap_buf_cache)
-		return -ENOMEM;
+		goto err_destroy_workqueue;
 
 	nvme_chap_buf_pool = mempool_create(16, mempool_alloc_slab,
 			mempool_free_slab, nvme_chap_buf_cache);
@@ -1021,6 +1028,8 @@ int __init nvme_init_auth(void)
 	return 0;
 err_destroy_chap_buf_cache:
 	kmem_cache_destroy(nvme_chap_buf_cache);
+err_destroy_workqueue:
+	destroy_workqueue(nvme_auth_wq);
 	return -ENOMEM;
 }
 
@@ -1028,4 +1037,5 @@ void __exit nvme_exit_auth(void)
 {
 	mempool_destroy(nvme_chap_buf_pool);
 	kmem_cache_destroy(nvme_chap_buf_cache);
+	destroy_workqueue(nvme_auth_wq);
 }
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 505e16f20e57..8b6421141162 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4921,7 +4921,9 @@ out_cleanup_admin_q:
 	blk_mq_destroy_queue(ctrl->admin_q);
 	blk_put_queue(ctrl->admin_q);
 out_free_tagset:
-	blk_mq_free_tag_set(ctrl->admin_tagset);
+	blk_mq_free_tag_set(set);
+	ctrl->admin_q = NULL;
+	ctrl->fabrics_q = NULL;
 	return ret;
 }
 EXPORT_SYMBOL_GPL(nvme_alloc_admin_tag_set);
@@ -4983,6 +4985,7 @@ int nvme_alloc_io_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 
 out_free_tag_set:
 	blk_mq_free_tag_set(set);
+	ctrl->connect_q = NULL;
 	return ret;
 }
 EXPORT_SYMBOL_GPL(nvme_alloc_io_tag_set);
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index ab2627e17bb9..1ab6601fdd5c 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1685,8 +1685,10 @@ nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport,
 		else {
 			queue = nvmet_fc_alloc_target_queue(iod->assoc, 0,
 					be16_to_cpu(rqst->assoc_cmd.sqsize));
-			if (!queue)
+			if (!queue) {
 				ret = VERR_QUEUE_ALLOC_FAIL;
+				nvmet_fc_tgt_a_put(iod->assoc);
+			}
 		}
 	}