Fix mismerge.

sql/field.cc

@@ -8615,7 +8615,7 @@ bool create_field::init(THD *thd, char *fld_name, enum_field_types fld_type,
         and 19 as length of 4.1 compatible representation.  Silently 
         shrink it to MAX_DATETIME_COMPRESSED_WIDTH.
       */
-	  DBUG_ASSERT(MAX_DATETIME_COMPRESSED_WIDTH < UINT_MAX);
+      DBUG_ASSERT(MAX_DATETIME_COMPRESSED_WIDTH < UINT_MAX);
       if (length != UINT_MAX)  /* avoid overflow; is safe because of min() */
         length= ((length+1)/2)*2;
       length= min(length, MAX_DATETIME_COMPRESSED_WIDTH);

sql/item_create.cc

@@ -531,7 +531,7 @@ Item *create_func_cast(Item *a, Cast_target cast_type,
       ulong decoded_size;
       errno= 0;
       decoded_size= strtoul(c_len, NULL, 10);
-      if (errno != 0)
+      if ((errno != 0) || (decoded_size > MAX_FIELD_BLOBLENGTH))
       {
         my_error(ER_TOO_BIG_DISPLAYWIDTH, MYF(0), "cast as char", MAX_FIELD_BLOBLENGTH);
         return NULL;