libceph: use the right footer size when skipping a message

ceph_msg_footer is 21 bytes long, while ceph_msg_footer_old is only 13.
Don't skip too much when CEPH_FEATURE_MSG_AUTH isn't negotiated.

Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index fec2081..9382619 100644 (file)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1197,6 +1197,13 @@ static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
        return new_piece;
 }
 
+static size_t sizeof_footer(struct ceph_connection *con)
+{
+       return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
+           sizeof(struct ceph_msg_footer) :
+           sizeof(struct ceph_msg_footer_old);
+}
+
 static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
 {
        BUG_ON(!msg);
@@ -2335,7 +2342,7 @@ static int read_partial_message(struct ceph_connection *con)
                        ceph_pr_addr(&con->peer_addr.in_addr),
                        seq, con->in_seq + 1);
                con->in_base_pos = -front_len - middle_len - data_len -
-                       sizeof(m->footer);
+                       sizeof_footer(con);
                con->in_tag = CEPH_MSGR_TAG_READY;
                return 1;
        } else if ((s64)seq - (s64)con->in_seq > 1) {
@@ -2360,7 +2367,7 @@ static int read_partial_message(struct ceph_connection *con)
                        /* skip this message */
                        dout("alloc_msg said skip message\n");
                        con->in_base_pos = -front_len - middle_len - data_len -
-                               sizeof(m->footer);
+                               sizeof_footer(con);
                        con->in_tag = CEPH_MSGR_TAG_READY;
                        con->in_seq++;
                        return 1;