ixed overflow bug in MyISAM and ISAM when using packed tables with a lot of fields and blobs

isam/open.c

@@ -415,6 +415,9 @@ static void setup_functions(register ISAM_SHARE *share)
     share->read_rnd=_nisam_read_rnd_dynamic_record;
     share->delete_record=_nisam_delete_dynamic_record;
     share->compare_record=_nisam_cmp_dynamic_record;
+
+    /* add bits used to pack data to pack_reclength for faster allocation */
+    share->base.pack_reclength+= share->base.pack_bits;
     if (share->base.blobs)
     {
       share->update_record=_nisam_update_blob_record;

myisam/mi_dynrec.c

@@ -62,7 +62,7 @@ int _mi_write_blob_record(MI_INFO *info, const byte *record)
 
   extra=ALIGN_SIZE(MI_MAX_DYN_BLOCK_HEADER)+MI_SPLIT_LENGTH+
     MI_DYN_DELETE_BLOCK_HEADER+1;
-  reclength= (info->s->base.pack_reclength+ info->s->base.pack_bits+
+  reclength= (info->s->base.pack_reclength+
 	      _my_calc_total_blob_length(info,record)+ extra);
   if (reclength > MI_DYN_MAX_ROW_LENGTH)
   {

myisam/mi_open.c

@@ -602,6 +602,8 @@ void mi_setup_functions(register MYISAM_SHARE *share)
     share->compare_unique=_mi_cmp_dynamic_unique;
     share->calc_checksum= mi_checksum;
 
+    /* add bits used to pack data to pack_reclength for faster allocation */
+    share->base.pack_reclength+= share->base.pack_bits;
     if (share->base.blobs)
     {
       share->update_record=_mi_update_blob_record;