ceph: zero unused message header, footer fields

We shouldn't leak any prior memory contents to other parties.  And random
data, particularly in the 'version' field, can cause problems down the
line.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
index 509f57d9ccb3..a3a8f368845b 100644
--- a/fs/ceph/messenger.c
+++ b/fs/ceph/messenger.c
@@ -2085,15 +2085,19 @@ struct ceph_msg *ceph_msg_new(int type, int front_len,
         kref_init(&m->kref);
         INIT_LIST_HEAD(&m->list_head);
 
+        m->hdr.tid = 0;
         m->hdr.type = cpu_to_le16(type);
+        m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
+        m->hdr.version = 0;
         m->hdr.front_len = cpu_to_le32(front_len);
         m->hdr.middle_len = 0;
         m->hdr.data_len = cpu_to_le32(page_len);
         m->hdr.data_off = cpu_to_le16(page_off);
-        m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
+        m->hdr.reserved = 0;
         m->footer.front_crc = 0;
         m->footer.middle_crc = 0;
         m->footer.data_crc = 0;
+        m->footer.flags = 0;
         m->front_max = front_len;
         m->front_is_vmalloc = false;
         m->more_to_follow = false;