BUG#21052 Modify the overflow error existed in last patch.

ndb/include/ndbapi/ndberror.h:
  Change unsigned int to int
ndb/src/mgmsrv/Services.cpp:
  Modify the overflow error existed in last patch. Change ther length of m_text to 512.
ndb/src/ndbapi/ndberror.c:
  Change the parameter of ndb_error_string from unsinged int to int.

ndb/include/ndbapi/ndberror.h

@@ -93,7 +93,7 @@ typedef  ndberror_classification_enum ndberror_classification;
 const char *ndberror_status_message(ndberror_status);
 const char *ndberror_classification_message(ndberror_classification);
 void ndberror_update(ndberror_struct *);
-int ndb_error_string(int err_no, char *str, unsigned int size);
+int ndb_error_string(int err_no, char *str, int size);
 
 #endif /* doxygen skip internal*/
 

ndb/src/mgmsrv/Services.cpp

@@ -1337,7 +1337,7 @@ Ndb_mgmd_event_service::log(int eventType, const Uint32* theData, NodeId nodeId)
   if (EventLoggerBase::event_lookup(eventType,cat,threshold,severity,textF))
     DBUG_VOID_RETURN;
 
-  char m_text[256];
+  char m_text[512];
   EventLogger::getText(m_text, sizeof(m_text),
 		       textF, theData, nodeId);
 
@@ -1356,8 +1356,11 @@ Ndb_mgmd_event_service::log(int eventType, const Uint32* theData, NodeId nodeId)
     if(strcmp(ndb_logevent_body[i].token,"error") == 0)
     {
       int m_text_len= strlen(m_text);
-      snprintf(m_text+m_text_len, 4 , " - ");
-      ndb_error_string(theData[3], m_text+(m_text_len+3), sizeof(m_text)-m_text_len-3);
+      if(sizeof(m_text)-m_text_len-3 > 0)
+      {
+        BaseString::snprintf(m_text+m_text_len, 4 , " - ");
+        ndb_error_string(val, m_text+(m_text_len+3), sizeof(m_text)-m_text_len-3);
+      }
     }
   }
 

ndb/src/ndbapi/ndberror.c

@@ -680,11 +680,14 @@ const char *ndberror_classification_message(ndberror_classification classificati
   return empty_string;
 }
 
-int ndb_error_string(int err_no, char *str, unsigned int size)
+int ndb_error_string(int err_no, char *str, int size)
 {
   ndberror_struct error;
-  unsigned int len;
+  int len;
 
+  assert(size > 1);
+  if(size <= 1) 
+    return 0;
   error.code = err_no;
   ndberror_update(&error);