Bug #73577 changeUser() call with useCompression=true could lead to IO freeze

• Submitted: 14 Aug 2014 8:06
• Modified: 9 Sep 2014 2:05
• Reporter: Alexander Soklakov
• Status: Closed
• Category: Connector / J
• Severity: S3 (Non-critical)
• Version: 5.1.31
• OS: Any
• Assigned to: Alexander Soklakov
• CPU Architecture: Any

[14 Aug 2014 8:06] Alexander Soklakov

Description:
mysqlInput was twice wrapped into CompressedInputStream in case of changeUser(), which ends with bad recursion and io freeze.

How to repeat:
Not possible without fixing Bug#19354014

Suggested fix:
This bug was found during analysis of Bug#19354014, the fix will be included to that patch.

[9 Sep 2014 2:05] Daniel So

Posted by developer:
 
Added the following entry to the Connector/J 5.1.33 changelog:

"changeUser() calls might result in a connection exception (“Got packets out of order”) or a freeze if the useCompression option was set to true."