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  1. MariaDB Connector/C
  2. CONC-535

mariadb_rpl_fetch strips 4 bytes from the SQL when server binlog_checksum is off

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    Description

      When mariadb server has binlog_checksum=NONE, mariadb_rpl_fetch is still assuming there's a checksum at the end of the packet, and gives 4 bytes too short SQL in QUERY_EVENT and ANNOTATE_ROWS_EVENT.

      It seems to be caused at line 238 in mariadb_rpl.c

            /* calculate statement size: buffer + buffer_size - current_ofs (ev) - crc_size */
      		 
            len= (size_t)(rpl->buffer + rpl->buffer_size - ev - 4);

      Which should have been

            len= (size_t)(rpl->buffer + rpl->buffer_size - ev - (rpl->use_checksum ? 4 : 0));

      And for ANNOTATE_ROWS_EVENT, at line 305:

            len= (uint32)(rpl->buffer + rpl->buffer_size - (unsigned char *)ev - 4);

      which should be, similarly:

            len= (uint32)(rpl->buffer + rpl->buffer_size - (unsigned char *)ev - (rpl->use_checksum ? 4 : 0));

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            georg Georg Richter
            rustyx Ruslan Altynbaev
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              Updated:
              Resolved:

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