dlm: dlm_process_incoming_buffer() fixes

* check that length is large enough to cover the non-variable part of message or
  rcom resp. (after checking that it's large enough to cover the header, of
  course).

* kill more pointless casts

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index ec61bbaf25df..65499ceaa516 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -403,6 +403,12 @@ struct dlm_rcom {
         char                    rc_buf[0];
 };
 
+union dlm_packet {
+        struct dlm_header       header;         /* common to other two */
+        struct dlm_message      message;
+        struct dlm_rcom         rcom;
+};
+
 struct rcom_config {
         uint32_t                rf_lvblen;
         uint32_t                rf_lsflags;