'SQLBinary.readFromStream' can enter endless loop
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Key: DERBY-1510
URL: http://issues.apache.org/jira/browse/DERBY-1510
Project: Derby
Type: Bug
Components: JDBC, SQL
Versions: 10.2.0.0
Reporter: Kristian Waagan
Assigned to: Kristian Waagan
Priority: Minor
Under certain circumstances, the method 'SQLBinary.readFromStream' can enter an
endless loop while reading the stream. The following must be true for the bug
to occur:
* There must be more data in the stream than what can fit into the initial
buffer (32 K).
* The method 'available' of the stream returns 0.
Since the default return value for 'InputStream.available' is 0, and the method
reading the stream can be used for data types CHAR FOR BIT DATA, VARCHAR FOR
BIT DATA and LONG VARCHAR FOR BIT DATA, the bug should be fixed. The maximum
length is 32700 bytes.
The method will also be used by SQLBlob, but it may be better to introduce a
new streaming method for it, since the current implementation has
memory-problems for large data (materializes the whole stream). A separate
issue should/will be created for this.
The symptom for this bug is a hang when calling one of the execute methods of
Prepared- or CallableStatement and maybe also certain set methods in ResultSet.
The visibility of this bug is very low, but the impact is severe/critical. When
the JDBC 4 length less streaming overloads are added (DERBY-1417), visibility
might increase.
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