nfsd-6.4 fixes:

- A collection of minor bug fixes
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Merge tag 'nfsd-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:

 - A collection of minor bug fixes

* tag 'nfsd-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  NFSD: Remove open coding of string copy
  SUNRPC: Fix trace_svc_register() call site
  SUNRPC: always free ctxt when freeing deferred request
  SUNRPC: double free xprt_ctxt while still in use
  SUNRPC: Fix error handling in svc_setup_socket()
  SUNRPC: Fix encoding of accepted but unsuccessful RPC replies
  lockd: define nlm_port_min,max with CONFIG_SYSCTL
  nfsd: define exports_proc_ops with CONFIG_PROC_FS
  SUNRPC: Avoid relying on crypto API to derive CBC-CTS output IV

fs/lockd/svc.c

@@ -77,9 +77,9 @@ static const unsigned long	nlm_grace_period_min = 0;
 static const unsigned long	nlm_grace_period_max = 240;
 static const unsigned long	nlm_timeout_min = 3;
 static const unsigned long	nlm_timeout_max = 20;
-static const int		nlm_port_min = 0, nlm_port_max = 65535;
 
 #ifdef CONFIG_SYSCTL
+static const int		nlm_port_min = 0, nlm_port_max = 65535;
 static struct ctl_table_header * nlm_sysctl_table;
 #endif
 

fs/nfsd/nfsctl.c

@@ -153,18 +153,6 @@ static int exports_net_open(struct net *net, struct file *file)
 	return 0;
 }
 
-static int exports_proc_open(struct inode *inode, struct file *file)
-{
-	return exports_net_open(current->nsproxy->net_ns, file);
-}
-
-static const struct proc_ops exports_proc_ops = {
-	.proc_open	= exports_proc_open,
-	.proc_read	= seq_read,
-	.proc_lseek	= seq_lseek,
-	.proc_release	= seq_release,
-};
-
 static int exports_nfsd_open(struct inode *inode, struct file *file)
 {
 	return exports_net_open(inode->i_sb->s_fs_info, file);
@@ -1458,6 +1446,19 @@ static struct file_system_type nfsd_fs_type = {
 MODULE_ALIAS_FS("nfsd");
 
 #ifdef CONFIG_PROC_FS
+
+static int exports_proc_open(struct inode *inode, struct file *file)
+{
+	return exports_net_open(current->nsproxy->net_ns, file);
+}
+
+static const struct proc_ops exports_proc_ops = {
+	.proc_open	= exports_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= seq_release,
+};
+
 static int create_proc_exports_entry(void)
 {
 	struct proc_dir_entry *entry;

fs/nfsd/trace.h

@@ -1365,19 +1365,19 @@ TRACE_EVENT(nfsd_cb_setup,
 		__field(u32, cl_id)
 		__field(unsigned long, authflavor)
 		__sockaddr(addr, clp->cl_cb_conn.cb_addrlen)
-		__array(unsigned char, netid, 8)
+		__string(netid, netid)
 	),
 	TP_fast_assign(
 		__entry->cl_boot = clp->cl_clientid.cl_boot;
 		__entry->cl_id = clp->cl_clientid.cl_id;
-		strlcpy(__entry->netid, netid, sizeof(__entry->netid));
+		__assign_str(netid, netid);
 		__entry->authflavor = authflavor;
 		__assign_sockaddr(addr, &clp->cl_cb_conn.cb_addr,
 				  clp->cl_cb_conn.cb_addrlen)
 	),
 	TP_printk("addr=%pISpc client %08x:%08x proto=%s flavor=%s",
 		__get_sockaddr(addr), __entry->cl_boot, __entry->cl_id,
-		__entry->netid, show_nfsd_authflavor(__entry->authflavor))
+		__get_str(netid), show_nfsd_authflavor(__entry->authflavor))
 );
 
 TRACE_EVENT(nfsd_cb_setup_err,

include/linux/sunrpc/svc_rdma.h

@@ -176,7 +176,7 @@ extern struct svc_rdma_recv_ctxt *
 extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
 				   struct svc_rdma_recv_ctxt *ctxt);
 extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
-extern void svc_rdma_release_rqst(struct svc_rqst *rqstp);
+extern void svc_rdma_release_ctxt(struct svc_xprt *xprt, void *ctxt);
 extern int svc_rdma_recvfrom(struct svc_rqst *);
 
 /* svc_rdma_rw.c */

include/linux/sunrpc/svc_xprt.h

@@ -23,7 +23,7 @@ struct svc_xprt_ops {
 	int		(*xpo_sendto)(struct svc_rqst *);
 	int		(*xpo_result_payload)(struct svc_rqst *, unsigned int,
 					      unsigned int);
-	void		(*xpo_release_rqst)(struct svc_rqst *);
+	void		(*xpo_release_ctxt)(struct svc_xprt *xprt, void *ctxt);
 	void		(*xpo_detach)(struct svc_xprt *);
 	void		(*xpo_free)(struct svc_xprt *);
 	void		(*xpo_kill_temp_xprt)(struct svc_xprt *);

net/sunrpc/auth_gss/gss_krb5_crypto.c

@@ -639,6 +639,16 @@ gss_krb5_cts_crypt(struct crypto_sync_skcipher *cipher, struct xdr_buf *buf,
 
 	ret = write_bytes_to_xdr_buf(buf, offset, data, len);
 
+#if IS_ENABLED(CONFIG_KUNIT)
+	/*
+	 * CBC-CTS does not define an output IV but RFC 3962 defines it as the
+	 * penultimate block of ciphertext, so copy that into the IV buffer
+	 * before returning.
+	 */
+	if (encrypt)
+		memcpy(iv, data, crypto_sync_skcipher_ivsize(cipher));
+#endif
+
 out:
 	kfree(data);
 	return ret;

net/sunrpc/svc.c

@@ -1052,7 +1052,7 @@ static int __svc_register(struct net *net, const char *progname,
 #endif
 	}
 
-	trace_svc_register(progname, version, protocol, port, family, error);
+	trace_svc_register(progname, version, family, protocol, port, error);
 	return error;
 }
 
@@ -1416,7 +1416,7 @@ err_bad_rpc:
 	/* Only RPCv2 supported */
 	xdr_stream_encode_u32(xdr, RPC_VERSION);
 	xdr_stream_encode_u32(xdr, RPC_VERSION);
-	goto sendit;
+	return 1;	/* don't wrap */
 
 err_bad_auth:
 	dprintk("svc: authentication failed (%d)\n",
@@ -1432,7 +1432,7 @@ err_bad_auth:
 err_bad_prog:
 	dprintk("svc: unknown program %d\n", rqstp->rq_prog);
 	serv->sv_stats->rpcbadfmt++;
-	xdr_stream_encode_u32(xdr, RPC_PROG_UNAVAIL);
+	*rqstp->rq_accept_statp = rpc_prog_unavail;
 	goto sendit;
 
 err_bad_vers:
@@ -1440,7 +1440,12 @@ err_bad_vers:
 		       rqstp->rq_vers, rqstp->rq_prog, progp->pg_name);
 
 	serv->sv_stats->rpcbadfmt++;
-	xdr_stream_encode_u32(xdr, RPC_PROG_MISMATCH);
+	*rqstp->rq_accept_statp = rpc_prog_mismatch;
+
+	/*
+	 * svc_authenticate() has already added the verifier and
+	 * advanced the stream just past rq_accept_statp.
+	 */
 	xdr_stream_encode_u32(xdr, process.mismatch.lovers);
 	xdr_stream_encode_u32(xdr, process.mismatch.hivers);
 	goto sendit;
@@ -1449,19 +1454,19 @@ err_bad_proc:
 	svc_printk(rqstp, "unknown procedure (%d)\n", rqstp->rq_proc);
 
 	serv->sv_stats->rpcbadfmt++;
-	xdr_stream_encode_u32(xdr, RPC_PROC_UNAVAIL);
+	*rqstp->rq_accept_statp = rpc_proc_unavail;
 	goto sendit;
 
 err_garbage_args:
 	svc_printk(rqstp, "failed to decode RPC header\n");
 
 	serv->sv_stats->rpcbadfmt++;
-	xdr_stream_encode_u32(xdr, RPC_GARBAGE_ARGS);
+	*rqstp->rq_accept_statp = rpc_garbage_args;
 	goto sendit;
 
 err_system_err:
 	serv->sv_stats->rpcbadfmt++;
-	xdr_stream_encode_u32(xdr, RPC_SYSTEM_ERR);
+	*rqstp->rq_accept_statp = rpc_system_err;
 	goto sendit;
 }
 

net/sunrpc/svc_xprt.c

@@ -532,13 +532,23 @@ void svc_reserve(struct svc_rqst *rqstp, int space)
 }
 EXPORT_SYMBOL_GPL(svc_reserve);
 
+static void free_deferred(struct svc_xprt *xprt, struct svc_deferred_req *dr)
+{
+	if (!dr)
+		return;
+
+	xprt->xpt_ops->xpo_release_ctxt(xprt, dr->xprt_ctxt);
+	kfree(dr);
+}
+
 static void svc_xprt_release(struct svc_rqst *rqstp)
 {
 	struct svc_xprt	*xprt = rqstp->rq_xprt;
 
-	xprt->xpt_ops->xpo_release_rqst(rqstp);
+	xprt->xpt_ops->xpo_release_ctxt(xprt, rqstp->rq_xprt_ctxt);
+	rqstp->rq_xprt_ctxt = NULL;
 
-	kfree(rqstp->rq_deferred);
+	free_deferred(xprt, rqstp->rq_deferred);
 	rqstp->rq_deferred = NULL;
 
 	svc_rqst_release_pages(rqstp);
@@ -1054,7 +1064,7 @@ static void svc_delete_xprt(struct svc_xprt *xprt)
 	spin_unlock_bh(&serv->sv_lock);
 
 	while ((dr = svc_deferred_dequeue(xprt)) != NULL)
-		kfree(dr);
+		free_deferred(xprt, dr);
 
 	call_xpt_users(xprt);
 	svc_xprt_put(xprt);
@@ -1176,8 +1186,8 @@ static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
 	if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) {
 		spin_unlock(&xprt->xpt_lock);
 		trace_svc_defer_drop(dr);
+		free_deferred(xprt, dr);
 		svc_xprt_put(xprt);
-		kfree(dr);
 		return;
 	}
 	dr->xprt = NULL;
@@ -1222,14 +1232,14 @@ static struct cache_deferred_req *svc_defer(struct cache_req *req)
 		dr->addrlen = rqstp->rq_addrlen;
 		dr->daddr = rqstp->rq_daddr;
 		dr->argslen = rqstp->rq_arg.len >> 2;
-		dr->xprt_ctxt = rqstp->rq_xprt_ctxt;
-		rqstp->rq_xprt_ctxt = NULL;
 
 		/* back up head to the start of the buffer and copy */
 		skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
 		memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip,
 		       dr->argslen << 2);
 	}
+	dr->xprt_ctxt = rqstp->rq_xprt_ctxt;
+	rqstp->rq_xprt_ctxt = NULL;
 	trace_svc_defer(rqstp);
 	svc_xprt_get(rqstp->rq_xprt);
 	dr->xprt = rqstp->rq_xprt;
@@ -1262,6 +1272,8 @@ static noinline int svc_deferred_recv(struct svc_rqst *rqstp)
 	rqstp->rq_daddr       = dr->daddr;
 	rqstp->rq_respages    = rqstp->rq_pages;
 	rqstp->rq_xprt_ctxt   = dr->xprt_ctxt;
+
+	dr->xprt_ctxt = NULL;
 	svc_xprt_received(rqstp->rq_xprt);
 	return dr->argslen << 2;
 }

net/sunrpc/svcsock.c

@@ -121,27 +121,27 @@ static void svc_reclassify_socket(struct socket *sock)
 #endif
 
 /**
- * svc_tcp_release_rqst - Release transport-related resources
- * @rqstp: request structure with resources to be released
+ * svc_tcp_release_ctxt - Release transport-related resources
+ * @xprt: the transport which owned the context
+ * @ctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt
  *
  */
-static void svc_tcp_release_rqst(struct svc_rqst *rqstp)
+static void svc_tcp_release_ctxt(struct svc_xprt *xprt, void *ctxt)
 {
 }
 
 /**
- * svc_udp_release_rqst - Release transport-related resources
- * @rqstp: request structure with resources to be released
+ * svc_udp_release_ctxt - Release transport-related resources
+ * @xprt: the transport which owned the context
+ * @ctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt
  *
  */
-static void svc_udp_release_rqst(struct svc_rqst *rqstp)
+static void svc_udp_release_ctxt(struct svc_xprt *xprt, void *ctxt)
 {
-	struct sk_buff *skb = rqstp->rq_xprt_ctxt;
+	struct sk_buff *skb = ctxt;
 
-	if (skb) {
-		rqstp->rq_xprt_ctxt = NULL;
+	if (skb)
 		consume_skb(skb);
-	}
 }
 
 union svc_pktinfo_u {
@@ -696,7 +696,8 @@ static int svc_udp_sendto(struct svc_rqst *rqstp)
 	unsigned int sent;
 	int err;
 
-	svc_udp_release_rqst(rqstp);
+	svc_udp_release_ctxt(xprt, rqstp->rq_xprt_ctxt);
+	rqstp->rq_xprt_ctxt = NULL;
 
 	svc_set_cmsg_data(rqstp, cmh);
 
@@ -768,7 +769,7 @@ static const struct svc_xprt_ops svc_udp_ops = {
 	.xpo_recvfrom = svc_udp_recvfrom,
 	.xpo_sendto = svc_udp_sendto,
 	.xpo_result_payload = svc_sock_result_payload,
-	.xpo_release_rqst = svc_udp_release_rqst,
+	.xpo_release_ctxt = svc_udp_release_ctxt,
 	.xpo_detach = svc_sock_detach,
 	.xpo_free = svc_sock_free,
 	.xpo_has_wspace = svc_udp_has_wspace,
@@ -895,6 +896,9 @@ static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
 		trace_svcsock_accept_err(xprt, serv->sv_name, err);
 		return NULL;
 	}
+	if (IS_ERR(sock_alloc_file(newsock, O_NONBLOCK, NULL)))
+		return NULL;
+
 	set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
 
 	err = kernel_getpeername(newsock, sin);
@@ -935,7 +939,7 @@ static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
 	return &newsvsk->sk_xprt;
 
 failed:
-	sock_release(newsock);
+	sockfd_put(newsock);
 	return NULL;
 }
 
@@ -1298,7 +1302,8 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp)
 	unsigned int sent;
 	int err;
 
-	svc_tcp_release_rqst(rqstp);
+	svc_tcp_release_ctxt(xprt, rqstp->rq_xprt_ctxt);
+	rqstp->rq_xprt_ctxt = NULL;
 
 	atomic_inc(&svsk->sk_sendqlen);
 	mutex_lock(&xprt->xpt_mutex);
@@ -1343,7 +1348,7 @@ static const struct svc_xprt_ops svc_tcp_ops = {
 	.xpo_recvfrom = svc_tcp_recvfrom,
 	.xpo_sendto = svc_tcp_sendto,
 	.xpo_result_payload = svc_sock_result_payload,
-	.xpo_release_rqst = svc_tcp_release_rqst,
+	.xpo_release_ctxt = svc_tcp_release_ctxt,
 	.xpo_detach = svc_tcp_sock_detach,
 	.xpo_free = svc_sock_free,
 	.xpo_has_wspace = svc_tcp_has_wspace,
@@ -1430,7 +1435,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 						struct socket *sock,
 						int flags)
 {
-	struct file	*filp = NULL;
 	struct svc_sock	*svsk;
 	struct sock	*inet;
 	int		pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
@@ -1439,14 +1443,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	if (!svsk)
 		return ERR_PTR(-ENOMEM);
 
-	if (!sock->file) {
-		filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
-		if (IS_ERR(filp)) {
-			kfree(svsk);
-			return ERR_CAST(filp);
-		}
-	}
-
 	inet = sock->sk;
 
 	if (pmap_register) {
@@ -1456,8 +1452,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 				     inet->sk_protocol,
 				     ntohs(inet_sk(inet)->inet_sport));
 		if (err < 0) {
-			if (filp)
-				fput(filp);
 			kfree(svsk);
 			return ERR_PTR(err);
 		}

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

@@ -239,21 +239,20 @@ void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
 }
 
 /**
- * svc_rdma_release_rqst - Release transport-specific per-rqst resources
- * @rqstp: svc_rqst being released
+ * svc_rdma_release_ctxt - Release transport-specific per-rqst resources
+ * @xprt: the transport which owned the context
+ * @vctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt
  *
  * Ensure that the recv_ctxt is released whether or not a Reply
  * was sent. For example, the client could close the connection,
  * or svc_process could drop an RPC, before the Reply is sent.
  */
-void svc_rdma_release_rqst(struct svc_rqst *rqstp)
+void svc_rdma_release_ctxt(struct svc_xprt *xprt, void *vctxt)
 {
-	struct svc_rdma_recv_ctxt *ctxt = rqstp->rq_xprt_ctxt;
-	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct svc_rdma_recv_ctxt *ctxt = vctxt;
 	struct svcxprt_rdma *rdma =
 		container_of(xprt, struct svcxprt_rdma, sc_xprt);
 
-	rqstp->rq_xprt_ctxt = NULL;
 	if (ctxt)
 		svc_rdma_recv_ctxt_put(rdma, ctxt);
 }

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -80,7 +80,7 @@ static const struct svc_xprt_ops svc_rdma_ops = {
 	.xpo_recvfrom = svc_rdma_recvfrom,
 	.xpo_sendto = svc_rdma_sendto,
 	.xpo_result_payload = svc_rdma_result_payload,
-	.xpo_release_rqst = svc_rdma_release_rqst,
+	.xpo_release_ctxt = svc_rdma_release_ctxt,
 	.xpo_detach = svc_rdma_detach,
 	.xpo_free = svc_rdma_free,
 	.xpo_has_wspace = svc_rdma_has_wspace,