Merge tag 'nfs-for-5.2-2' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client fixes from Anna Schumaker:
 "These are mostly stable bugfixes found during testing, many during the
  recent NFS bake-a-thon.

  Stable bugfixes:
   - SUNRPC: Fix regression in umount of a secure mount
   - SUNRPC: Fix a use after free when a server rejects the RPCSEC_GSS credential
   - NFSv4.1: Again fix a race where CB_NOTIFY_LOCK fails to wake a waiter
   - NFSv4.1: Fix bug only first CB_NOTIFY_LOCK is handled

  Other bugfixes:
   - xprtrdma: Use struct_size() in kzalloc()"

* tag 'nfs-for-5.2-2' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  NFSv4.1: Fix bug only first CB_NOTIFY_LOCK is handled
  NFSv4.1: Again fix a race where CB_NOTIFY_LOCK fails to wake a waiter
  SUNRPC: Fix a use after free when a server rejects the RPCSEC_GSS credential
  SUNRPC fix regression in umount of a secure mount
  xprtrdma: Use struct_size() in kzalloc()

1 files changed, 12 insertions, 20 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c29cbef6b53f..e38f4af20950 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6932,7 +6932,6 @@ struct nfs4_lock_waiter {
 	struct task_struct	*task;
 	struct inode		*inode;
 	struct nfs_lowner	*owner;
-	bool			notified;
 };
 
 static int
@@ -6954,13 +6953,13 @@ nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, vo
 		/* Make sure it's for the right inode */
 		if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
 			return 0;
-
-		waiter->notified = true;
 	}
 
 	/* override "private" so we can use default_wake_function */
 	wait->private = waiter->task;
-	ret = autoremove_wake_function(wait, mode, flags, key);
+	ret = woken_wake_function(wait, mode, flags, key);
+	if (ret)
+		list_del_init(&wait->entry);
 	wait->private = waiter;
 	return ret;
 }
@@ -6969,7 +6968,6 @@ static int
 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
 {
 	int status = -ERESTARTSYS;
-	unsigned long flags;
 	struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
 	struct nfs_server *server = NFS_SERVER(state->inode);
 	struct nfs_client *clp = server->nfs_client;
@@ -6979,8 +6977,7 @@ nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
 				    .s_dev = server->s_dev };
 	struct nfs4_lock_waiter waiter = { .task  = current,
 					   .inode = state->inode,
-					   .owner = &owner,
-					   .notified = false };
+					   .owner = &owner};
 	wait_queue_entry_t wait;
 
 	/* Don't bother with waitqueue if we don't expect a callback */
@@ -6990,27 +6987,22 @@ nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
 	init_wait(&wait);
 	wait.private = &waiter;
 	wait.func = nfs4_wake_lock_waiter;
-	add_wait_queue(q, &wait);
 
 	while(!signalled()) {
-		waiter.notified = false;
+		add_wait_queue(q, &wait);
 		status = nfs4_proc_setlk(state, cmd, request);
-		if ((status != -EAGAIN) || IS_SETLK(cmd))
+		if ((status != -EAGAIN) || IS_SETLK(cmd)) {
+			finish_wait(q, &wait);
 			break;
-
-		status = -ERESTARTSYS;
-		spin_lock_irqsave(&q->lock, flags);
-		if (waiter.notified) {
-			spin_unlock_irqrestore(&q->lock, flags);
-			continue;
 		}
-		set_current_state(TASK_INTERRUPTIBLE);
-		spin_unlock_irqrestore(&q->lock, flags);
 
-		freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT);
+		status = -ERESTARTSYS;
+		freezer_do_not_count();
+		wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
+		freezer_count();
+		finish_wait(q, &wait);
 	}
 
-	finish_wait(q, &wait);
 	return status;
 }
 #else /* !CONFIG_NFS_V4_1 */