Vivek Nadkarni created AVRO-1165:
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Summary: Avro-C: Memory leak in value iface containing AVRO_LINK.
Key: AVRO-1165
URL: https://issues.apache.org/jira/browse/AVRO-1165
Project: Avro
Issue Type: Bug
Components: c
Affects Versions: 1.7.1
Environment: Ubuntu Linux 11.10
Reporter: Vivek Nadkarni
Fix For: 1.7.2
A memory leak can be seen when the following matched pair of commands is
called, using a schema containing an AVRO_LINK. This pair of commands
constructs a class (value iface) from a schema and then destroys the
constructed class.
record_class = avro_generic_class_from_schema( schema );
avro_value_iface_decref( record_class );
If schema contains an AVRO_LINK, then avro_generic_class_from_schema() calls
avro_generic_link_class(), which calls avro_schema_incref() on the AVRO_LINK
target schema and assigns the target schema pointer to the iface->schema.
When we subsequently call avro_value_iface_decref() to deallocate the class,
this function calls avro_generic_link_decref_iface(), which frees the memory
for the link interface without calling avro_schema_decref() on the target
schema pointed to by iface->schema.
Thus the memory of the target schema is leaked when we create and destroy a
value interface for an AVRO_LINK.
Calling avro_schema_decref() on the the target schema (iface->schema) before
calling avro_freet() on the iface fixes this memory leak.
Note: The pair of commands shown above results in a memory leak, when we create
and destroy a value interface from *any* schema containing an AVRO_LINK,
regardless of whether it is recursive or not. There is a separate issue
regarding memory leaks with recursive schemas described in AVRO-766. The fix
for this issue can only be tested with non-recursive schemas containing
AVRO_LINKs until AVRO-766 is fixed.
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