commit 741ff1d99619f170223e51e01efe4d089e292722
Author: Jeremy Cole <jeremycole@google.com>
Date:   Thu Jul 11 16:12:02 2013 -0700

    Pass through the received event's common_header_len
    
    When passing through a Format_description_log_event from a master's
    binlog through the slave's relay log, the common_header_len field was
    being overwritten with LOG_EVENT_HEADER_LEN instead of passing through
    the common_header_len that was received with the event.
    
    This would cause relay logs to be corrupted after log rotate events if
    the master from which the slave was replicating was using a different
    common_header_len.
    
    Change-Id: I882319e6e6c0633bc269fafd7dfc4b1a18c9277d

diff --git a/sql/log_event.cc b/sql/log_event.cc
index 9cd6523..88b8612 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -4892,7 +4892,7 @@ bool Format_description_log_event::write(IO_CACHE* file)
   if (!dont_set_created)
     created= get_time();
   int4store(buff + ST_CREATED_OFFSET,created);
-  buff[ST_COMMON_HEADER_LEN_OFFSET]= LOG_EVENT_HEADER_LEN;
+  buff[ST_COMMON_HEADER_LEN_OFFSET]= common_header_len;
   memcpy((char*) buff+ST_COMMON_HEADER_LEN_OFFSET + 1, (uchar*) post_header_len,
          LOG_EVENT_TYPES);
   /*