NFS: hard-code init_net for NFS callback transports

upstream commit 12918b10d59e975fd5241eef03ef9e6d5ea3dcfe.

In case of destroying mount namespace on child reaper exit, nsproxy is zeroed
to the point already. So, dereferencing of it is invalid.
This patch hard-code "init_net" for all network namespace references for NFS
callback services. This will be fixed with proper NFS callback
containerization.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index cff3940..38a44c6 100644 (file)
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -17,7 +17,6 @@
 #include <linux/kthread.h>
 #include <linux/sunrpc/svcauth_gss.h>
 #include <linux/sunrpc/bc_xprt.h>
-#include <linux/nsproxy.h>
 
 #include <net/inet_sock.h>
 
@@ -107,7 +106,7 @@ nfs4_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
 {
        int ret;
 
-       ret = svc_create_xprt(serv, "tcp", xprt->xprt_net, PF_INET,
+       ret = svc_create_xprt(serv, "tcp", &init_net, PF_INET,
                                nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
        if (ret <= 0)
                goto out_err;
@@ -115,7 +114,7 @@ nfs4_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
        dprintk("NFS: Callback listener port = %u (af %u)\n",
                        nfs_callback_tcpport, PF_INET);
 
-       ret = svc_create_xprt(serv, "tcp", xprt->xprt_net, PF_INET6,
+       ret = svc_create_xprt(serv, "tcp", &init_net, PF_INET6,
                                nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
        if (ret > 0) {
                nfs_callback_tcpport6 = ret;
@@ -184,7 +183,7 @@ nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
         * fore channel connection.
         * Returns the input port (0) and sets the svc_serv bc_xprt on success
         */
-       ret = svc_create_xprt(serv, "tcp-bc", xprt->xprt_net, PF_INET, 0,
+       ret = svc_create_xprt(serv, "tcp-bc", &init_net, PF_INET, 0,
                              SVC_SOCK_ANONYMOUS);
        if (ret < 0) {
                rqstp = ERR_PTR(ret);
@@ -254,7 +253,7 @@ int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
        char svc_name[12];
        int ret = 0;
        int minorversion_setup;
-       struct net *net = current->nsproxy->net_ns;
+       struct net *net = &init_net;
 
        mutex_lock(&nfs_callback_mutex);
        if (cb_info->users++ || cb_info->task != NULL) {
@@ -330,7 +329,7 @@ void nfs_callback_down(int minorversion)
        cb_info->users--;
        if (cb_info->users == 0 && cb_info->task != NULL) {
                kthread_stop(cb_info->task);
-               svc_shutdown_net(cb_info->serv, current->nsproxy->net_ns);
+               svc_shutdown_net(cb_info->serv, &init_net);
                svc_exit_thread(cb_info->rqst);
                cb_info->serv = NULL;
                cb_info->rqst = NULL;