libceph: fix uninitialized value when no get_authorizer method is set

If there is no get_authorizer method we set the out_kvec to a bogus
pointer.  The length is also zero in that case, so it doesn't much matter,
but it's better not to add the empty item in the first place.

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

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index b140dd3..ce326c8 100644 (file)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -619,11 +619,12 @@ static int prepare_connect_authorizer(struct ceph_connection *con)
        con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
        con->out_connect.authorizer_len = cpu_to_le32(auth_len);
 
-       con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
-       con->out_kvec[con->out_kvec_left].iov_len = auth_len;
-       con->out_kvec_left++;
-       con->out_kvec_bytes += auth_len;
-
+       if (auth_len) {
+               con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
+               con->out_kvec[con->out_kvec_left].iov_len = auth_len;
+               con->out_kvec_left++;
+               con->out_kvec_bytes += auth_len;
+       }
        return 0;
 }