CIFS: Make accessing is_valid_oplock/dump_detail ops struct field safe

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ccafded..3647b1a 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1058,13 +1058,15 @@ cifs_demultiplex_thread(void *p)
                if (mid_entry != NULL) {
                        if (!mid_entry->multiRsp || mid_entry->multiEnd)
                                mid_entry->callback(mid_entry);
-               } else if (!server->ops->is_oplock_break(buf, server)) {
+               } else if (!server->ops->is_oplock_break ||
+                          !server->ops->is_oplock_break(buf, server)) {
                        cERROR(1, "No task to wake, unknown frame received! "
                                   "NumMids %d", atomic_read(&midCount));
                        cifs_dump_mem("Received Data is: ", buf,
                                      HEADER_SIZE(server));
 #ifdef CONFIG_CIFS_DEBUG2
-                       server->ops->dump_detail(buf);
+                       if (server->ops->dump_detail)
+                               server->ops->dump_detail(buf);
                        cifs_dump_mids(server);
 #endif /* CIFS_DEBUG2 */