Security Fix: For servers built with yaSSL, a preauthorization buffer overflow could cause memory corruption or a server crash. We thank Evgeny Legerov from Intevydis for providing us with a proof-of-concept script that permitted us to reproduce this bug. (Bug #50227, CVE-2009-4484)

Replication: FLUSH LOGS did not close and reopen the binary log index file. (Bug #48738)

References: See also Bug #34582.

Comparison with NULL values sometimes did not produce a correct result. (Bug #42760)

Valgrind warnings for CHECKSUM TABLE were corrected. (Bug #49465)

On Solaris, the server printed no stack trace to the error log after a crash. (Bug #47391)

The error message for ER_UPDATE_INFO was subject to buffer overflow or truncation. (Bug #48500)

Specifying an index algorithm (such as BTREE) for SPATIAL or FULLTEXT indexes caused a server crash. These index types do not support algorithm specification, and it is not longer permitted to do so. (Bug #49250)

The optimizer sometimes incorrectly handled conditions of the form WHERE col_name='const1' AND col_name='const2'. (Bug #49199)

When compressed MyISAM files were opened, they were always memory mapped, sometimes causing memory-swapping problems. To deal with this, a new system variable, myisam_mmap_size, was added to permit limiting the amount of memory used for memory mapping of MyISAM files. (Bug #37408)

Re-execution of a prepared statement could cause a server crash. (Bug #48508)

Incomplete reset of internal TABLE structures could cause a crash with eq_ref table access in subqueries. (Bug #48709)

On Fedora 12, strmov() did not guarantee correct operation for overlapping source and destination buffer. Calls were fixed to use an overlap-safe version instead. (Bug #48866)

Several strmake() calls had an incorrect length argument (too large by one). (Bug #48983)

Some prepared statements could raise an assertion when re-executed. (Bug #49570)

A crash occurred when a user variable that was assigned to a subquery result was used as a result field in a SELECT statement with aggregate functions. (Bug #47371)