diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 91d7783eee7df..47b3aa42b21d3 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -681,42 +681,53 @@ void ceph_destroy_client(struct ceph_client *client)
 }
 EXPORT_SYMBOL(ceph_destroy_client);
 
-/*
- * true if we have the mon map (and have thus joined the cluster)
- */
-static bool have_mon_and_osd_map(struct ceph_client *client)
-{
-	return client->monc.monmap && client->monc.monmap->epoch &&
-	       client->osdc.osdmap && client->osdc.osdmap->epoch;
-}
-
 /*
  * mount: join the ceph cluster, and open root directory.
  */
 int __ceph_open_session(struct ceph_client *client, unsigned long started)
 {
-	unsigned long timeout = client->options->mount_timeout;
-	long err;
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	long timeout = ceph_timeout_jiffies(client->options->mount_timeout);
+	bool have_monmap, have_osdmap;
+	int err;
 
 	/* open session, and wait for mon and osd maps */
 	err = ceph_monc_open_session(&client->monc);
 	if (err < 0)
 		return err;
 
-	while (!have_mon_and_osd_map(client)) {
-		if (timeout && time_after_eq(jiffies, started + timeout))
-			return -ETIMEDOUT;
+	add_wait_queue(&client->auth_wq, &wait);
+	for (;;) {
+		mutex_lock(&client->monc.mutex);
+		err = client->auth_err;
+		have_monmap = client->monc.monmap && client->monc.monmap->epoch;
+		mutex_unlock(&client->monc.mutex);
+
+		down_read(&client->osdc.lock);
+		have_osdmap = client->osdc.osdmap && client->osdc.osdmap->epoch;
+		up_read(&client->osdc.lock);
+
+		if (err || (have_monmap && have_osdmap))
+			break;
+
+		if (signal_pending(current)) {
+			err = -ERESTARTSYS;
+			break;
+		}
+
+		if (!timeout) {
+			err = -ETIMEDOUT;
+			break;
+		}
 
 		/* wait */
 		dout("mount waiting for mon_map\n");
-		err = wait_event_interruptible_timeout(client->auth_wq,
-			have_mon_and_osd_map(client) || (client->auth_err < 0),
-			ceph_timeout_jiffies(timeout));
-		if (err < 0)
-			return err;
-		if (client->auth_err < 0)
-			return client->auth_err;
+		timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout);
 	}
+	remove_wait_queue(&client->auth_wq, &wait);
+
+	if (err)
+		return err;
 
 	pr_info("client%llu fsid %pU\n", ceph_client_gid(client),
 		&client->fsid);
diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
index 009767c3bcaa4..9f3540a1f7d8b 100644
--- a/net/ceph/debugfs.c
+++ b/net/ceph/debugfs.c
@@ -35,8 +35,9 @@ static int monmap_show(struct seq_file *s, void *p)
 	int i;
 	struct ceph_client *client = s->private;
 
+	mutex_lock(&client->monc.mutex);
 	if (client->monc.monmap == NULL)
-		return 0;
+		goto out_unlock;
 
 	seq_printf(s, "epoch %d\n", client->monc.monmap->epoch);
 	for (i = 0; i < client->monc.monmap->num_mon; i++) {
@@ -47,6 +48,9 @@ static int monmap_show(struct seq_file *s, void *p)
 			   ENTITY_NAME(inst->name),
 			   ceph_pr_addr(&inst->addr.in_addr));
 	}
+
+out_unlock:
+	mutex_unlock(&client->monc.mutex);
 	return 0;
 }
 
@@ -55,13 +59,14 @@ static int osdmap_show(struct seq_file *s, void *p)
 	int i;
 	struct ceph_client *client = s->private;
 	struct ceph_osd_client *osdc = &client->osdc;
-	struct ceph_osdmap *map = osdc->osdmap;
+	struct ceph_osdmap *map;
 	struct rb_node *n;
 
+	down_read(&osdc->lock);
+	map = osdc->osdmap;
 	if (map == NULL)
-		return 0;
+		goto out_unlock;
 
-	down_read(&osdc->lock);
 	seq_printf(s, "epoch %u barrier %u flags 0x%x\n", map->epoch,
 			osdc->epoch_barrier, map->flags);
 
@@ -128,6 +133,7 @@ static int osdmap_show(struct seq_file *s, void *p)
 		seq_printf(s, "]\n");
 	}
 
+out_unlock:
 	up_read(&osdc->lock);
 	return 0;
 }
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
index 30e8d123a8b39..67ae99a3b5273 100644
--- a/net/ipv6/exthdrs_core.c
+++ b/net/ipv6/exthdrs_core.c
@@ -142,6 +142,8 @@ int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
 			optlen = 1;
 			break;
 		default:
+			if (len < 2)
+				goto bad;
 			optlen = nh[offset + 1] + 2;
 			if (optlen > len)
 				goto bad;
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index ed10927be0b8f..77d220baa9477 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1650,10 +1650,16 @@ hfsc_dequeue(struct Qdisc *sch)
 		if (cl->qdisc->q.qlen != 0) {
 			/* update ed */
 			next_len = qdisc_peek_len(cl->qdisc);
-			if (realtime)
-				update_ed(cl, next_len);
-			else
-				update_d(cl, next_len);
+			/* Check queue length again since some qdisc implementations
+			 * (e.g., netem/codel) might empty the queue during the peek
+			 * operation.
+			 */
+			if (cl->qdisc->q.qlen != 0) {
+				if (realtime)
+					update_ed(cl, next_len);
+				else
+					update_d(cl, next_len);
+			}
 		} else {
 			/* the class becomes passive */
 			eltree_remove(cl);