Scenario: You are replicating from MySQL 5.0 or MySQL 5.1 as master to a MariaDB 5.3 or MariaDB 5.5 slave. This is what you do as a means of upgrading your entire roll-out. You see the following error message:
[Warning] Slave I/O: Notifying master by SET @master_binlog_checksum= @@global.binlog_checksum failed with error: Unknown system variable 'binlog_checksum', Error_code: 1193
Don't worry. This error message seems reasonable, since your master does not know about binlog_checksum. Binary log event checksums were included in MariaDB 5.3 and greater, as a backport from MySQL 5.6.
There should be no data corruption naturally, and even Bug #955057 is not related to this.