Merge tag 'nfs-for-6.6-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client fixes from Anna Schumaker:
 "Stable fixes:
   - Revert "SUNRPC dont update timeout value on connection reset"
   - NFSv4: Fix a state manager thread deadlock regression

  Fixes:
   - Fix potential NULL pointer dereference in nfs_inode_remove_request()
   - Fix rare NULL pointer dereference in xs_tcp_tls_setup_socket()
   - Fix long delay before failing a TLS mount when server does not
     support TLS
   - Fix various NFS state manager issues"

* tag 'nfs-for-6.6-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  nfs: decrement nrequests counter before releasing the req
  SUNRPC/TLS: Lock the lower_xprt during the tls handshake
  Revert "SUNRPC dont update timeout value on connection reset"
  NFSv4: Fix a state manager thread deadlock regression
  NFSv4: Fix a nfs4_state_manager() race
  SUNRPC: Fail quickly when server does not recognize TLS

7 files changed, 63 insertions, 22 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3508d82388263e..7016eaadf55540 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -10622,7 +10622,9 @@ static void nfs4_disable_swap(struct inode *inode)
 	 */
 	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
 
-	nfs4_schedule_state_manager(clp);
+	set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
+	clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
+	wake_up_var(&clp->cl_state);
 }
 
 static const struct inode_operations nfs4_dir_inode_operations = {
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index e079987af4a3e4..9a5d911a7edc77 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1209,16 +1209,26 @@ void nfs4_schedule_state_manager(struct nfs_client *clp)
 {
 	struct task_struct *task;
 	char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
+	struct rpc_clnt *clnt = clp->cl_rpcclient;
+	bool swapon = false;
 
-	if (clp->cl_rpcclient->cl_shutdown)
+	if (clnt->cl_shutdown)
 		return;
 
 	set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
-	if (test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) != 0) {
-		wake_up_var(&clp->cl_state);
-		return;
+
+	if (atomic_read(&clnt->cl_swapper)) {
+		swapon = !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE,
+					   &clp->cl_state);
+		if (!swapon) {
+			wake_up_var(&clp->cl_state);
+			return;
+		}
 	}
-	set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
+
+	if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
+		return;
+
 	__module_get(THIS_MODULE);
 	refcount_inc(&clp->cl_count);
 
@@ -1235,8 +1245,9 @@ void nfs4_schedule_state_manager(struct nfs_client *clp)
 			__func__, PTR_ERR(task));
 		if (!nfs_client_init_is_complete(clp))
 			nfs_mark_client_ready(clp, PTR_ERR(task));
+		if (swapon)
+			clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
 		nfs4_clear_state_manager_bit(clp);
-		clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
 		nfs_put_client(clp);
 		module_put(THIS_MODULE);
 	}
@@ -2703,6 +2714,13 @@ static void nfs4_state_manager(struct nfs_client *clp)
 		nfs4_end_drain_session(clp);
 		nfs4_clear_state_manager_bit(clp);
 
+		if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
+		    !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
+				      &clp->cl_state)) {
+			memflags = memalloc_nofs_save();
+			continue;
+		}
+
 		if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
 			if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
 				nfs_client_return_marked_delegations(clp);
@@ -2741,22 +2759,25 @@ static int nfs4_run_state_manager(void *ptr)
 
 	allow_signal(SIGKILL);
 again:
-	set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
 	nfs4_state_manager(clp);
-	if (atomic_read(&cl->cl_swapper)) {
+
+	if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
+	    !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
 		wait_var_event_interruptible(&clp->cl_state,
 					     test_bit(NFS4CLNT_RUN_MANAGER,
 						      &clp->cl_state));
-		if (atomic_read(&cl->cl_swapper) &&
-		    test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
+		if (!atomic_read(&cl->cl_swapper))
+			clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
+		if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
+		    !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
 			goto again;
 		/* Either no longer a swapper, or were signalled */
+		clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
 	}
-	clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
 
 	if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
 	    test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
-	    !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state))
+	    !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
 		goto again;
 
 	nfs_put_client(clp);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 8c1ee1a1a28f11..7720b5e43014b4 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -802,8 +802,8 @@ static void nfs_inode_remove_request(struct nfs_page *req)
 	}
 
 	if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) {
-		nfs_release_request(req);
 		atomic_long_dec(&NFS_I(nfs_page_to_inode(req))->nrequests);
+		nfs_release_request(req);
 	}
 }
 
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 2f16f9d1796624..814b0169f97230 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -769,9 +769,14 @@ int rpcauth_wrap_req(struct rpc_task *task, struct xdr_stream *xdr)
  * @task: controlling RPC task
  * @xdr: xdr_stream containing RPC Reply header
  *
- * On success, @xdr is updated to point past the verifier and
- * zero is returned. Otherwise, @xdr is in an undefined state
- * and a negative errno is returned.
+ * Return values:
+ *   %0: Verifier is valid. @xdr now points past the verifier.
+ *   %-EIO: Verifier is corrupted or message ended early.
+ *   %-EACCES: Verifier is intact but not valid.
+ *   %-EPROTONOSUPPORT: Server does not support the requested auth type.
+ *
+ * When a negative errno is returned, @xdr is left in an undefined
+ * state.
  */
 int
 rpcauth_checkverf(struct rpc_task *task, struct xdr_stream *xdr)
diff --git a/net/sunrpc/auth_tls.c b/net/sunrpc/auth_tls.c
index de7678f8a23d26..87f570fd3b00ea 100644
--- a/net/sunrpc/auth_tls.c
+++ b/net/sunrpc/auth_tls.c
@@ -129,9 +129,9 @@ static int tls_validate(struct rpc_task *task, struct xdr_stream *xdr)
 	if (*p != rpc_auth_null)
 		return -EIO;
 	if (xdr_stream_decode_opaque_inline(xdr, &str, starttls_len) != starttls_len)
-		return -EIO;
+		return -EPROTONOSUPPORT;
 	if (memcmp(str, starttls_token, starttls_len))
-		return -EIO;
+		return -EPROTONOSUPPORT;
 	return 0;
 }
 
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 37b0b212b93475..9c210273d06b7f 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -2476,8 +2476,7 @@ call_status(struct rpc_task *task)
 		goto out_exit;
 	}
 	task->tk_action = call_encode;
-	if (status != -ECONNRESET && status != -ECONNABORTED)
-		rpc_check_timeout(task);
+	rpc_check_timeout(task);
 	return;
 out_exit:
 	rpc_call_rpcerror(task, status);
@@ -2725,7 +2724,15 @@ out_unparsable:
 
 out_verifier:
 	trace_rpc_bad_verifier(task);
-	goto out_garbage;
+	switch (error) {
+	case -EPROTONOSUPPORT:
+		goto out_err;
+	case -EACCES:
+		/* Re-encode with a fresh cred */
+		fallthrough;
+	default:
+		goto out_garbage;
+	}
 
 out_msg_denied:
 	error = -EACCES;
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 71cd916e384f17..a15bf2ede89bf5 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2672,6 +2672,10 @@ static void xs_tcp_tls_setup_socket(struct work_struct *work)
 	rcu_read_lock();
 	lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
 	rcu_read_unlock();
+
+	if (wait_on_bit_lock(&lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
+		goto out_unlock;
+
 	status = xs_tls_handshake_sync(lower_xprt, &upper_xprt->xprtsec);
 	if (status) {
 		trace_rpc_tls_not_started(upper_clnt, upper_xprt);
@@ -2681,6 +2685,7 @@ static void xs_tcp_tls_setup_socket(struct work_struct *work)
 	status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
 	if (status)
 		goto out_close;
+	xprt_release_write(lower_xprt, NULL);
 
 	trace_rpc_socket_connect(upper_xprt, upper_transport->sock, 0);
 	if (!xprt_test_and_set_connected(upper_xprt)) {
@@ -2702,6 +2707,7 @@ out_unlock:
 	return;
 
 out_close:
+	xprt_release_write(lower_xprt, NULL);
 	rpc_shutdown_client(lower_clnt);
 
 	/* xprt_force_disconnect() wakes tasks with a fixed tk_status code.