afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID

BugLink: http://bugs.launchpad.net/bugs/1794889
[ Upstream commit 001ab5a67ee5d191c64aebf4b4ef8c7a0dcfd2bc ]

Fix the handling of the CB.InitCallBackState3 service call to find the
record of a server that we're using by looking it up by the UUID passed as
the parameter rather than by its address (of which it might have many, and
which may change).

Fixes: c35eccb1f614 ("[AFS]: Implement the CB.InitCallBackState3 operation.")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
index 41e277f57b20f5e03833abc42aaacea75aff2f73..c0b53bfef49048e18b7528d1d3ad150151dbeb1d 100644 (file)
--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -341,7 +341,6 @@ static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
  */
 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
 {
-       struct sockaddr_rxrpc srx;
        struct afs_server *server;
        struct afs_uuid *r;
        unsigned loop;
@@ -398,8 +397,9 @@ static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
 
        /* we'll need the file server record as that tells us which set of
         * vnodes to operate upon */
-       rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
-       server = afs_find_server(call->net, &srx);
+       rcu_read_lock();
+       server = afs_find_server_by_uuid(call->net, call->request);
+       rcu_read_unlock();
        if (!server)
                return -ENOTCONN;
        call->cm_server = server;