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https://issues.apache.org/jira/browse/AXIS2C-1222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Supun Kamburugamuva reassigned AXIS2C-1222:
-------------------------------------------
Assignee: Supun Kamburugamuva
> Axis2/C AXIOM libxml2 parser frees the IO context before calling the
> AXIS2_CLOSE_INPUT_CALLBACK
> -----------------------------------------------------------------------------------------------
>
> Key: AXIS2C-1222
> URL: https://issues.apache.org/jira/browse/AXIS2C-1222
> Project: Axis2-C
> Issue Type: Bug
> Components: xml/parser
> Affects Versions: 1.4.0
> Environment: Linux/Unix with libxml2 parser
> Reporter: Chris Rose
> Assignee: Supun Kamburugamuva
>
> Running under valgrind, I get this invalid read error:
> ==21882== Invalid read of size 4
> ==21882== at 0x43F6F69: axiom_close_gstream (axis2c_util.c:246)
> ==21882== by 0x44F418F: axis2_libxml2_reader_wrapper_close_input_callback
> (libxml2_reader_wrapper.c:964)
> ==21882== by 0x451BD8C: xmlFreeParserInputBuffer (xmlIO.c:2307)
> ==21882== by 0x4571E6A: xmlTextReaderClose (xmlreader.c:2255)
> ==21882== by 0x44F381C: axis2_libxml2_reader_wrapper_free
> (libxml2_reader_wrapper.c:505)
> ==21882== by 0x44F2686: axiom_xml_reader_free (xml_reader.c:34)
> ==21882== by 0x444F914: axiom_stax_builder_free (om_stax_builder.c:909)
> ==21882== by 0x43F6D65: Axis2_axiom_deserialize_buffer (axis2c_util.c:152)
> ==21882== by 0x43F6820: Axis2c_cmd_svc_client (axis2c.c:419)
> ==21882== by 0x402EA62: TclEvalObjvInternal (tclBasic.c:3084)
> ==21882== by 0x402F56B: Tcl_EvalEx (tclBasic.c:3674)
> ==21882== by 0x4083D91: Tcl_FSEvalFile (tclIOUtil.c:1651)
> ==21882== Address 0x47616F0 is 0 bytes inside a block of size 56 free'd
> ==21882== at 0x400513F: free (vg_replace_malloc.c:233)
> ==21882== by 0x441AEA3: axutil_allocator_free_impl (allocator.c:91)
> ==21882== by 0x44F3804: axis2_libxml2_reader_wrapper_free
> (libxml2_reader_wrapper.c:500)
> ==21882== by 0x44F2686: axiom_xml_reader_free (xml_reader.c:34)
> ==21882== by 0x444F914: axiom_stax_builder_free (om_stax_builder.c:909)
> ==21882== by 0x43F6D65: Axis2_axiom_deserialize_buffer (axis2c_util.c:152)
> ==21882== by 0x43F6820: Axis2c_cmd_svc_client (axis2c.c:419)
> ==21882== by 0x402EA62: TclEvalObjvInternal (tclBasic.c:3084)
> ==21882== by 0x402F56B: Tcl_EvalEx (tclBasic.c:3674)
> ==21882== by 0x4083D91: Tcl_FSEvalFile (tclIOUtil.c:1651)
> ==21882== by 0x408C036: Tcl_Main (tclMain.c:292)
> ==21882== by 0x80486B3: main (in /home/rosec/install/fc/bin/tclsh8.4)
> From this I can see that in the libxml2 reader wrapper code, the context of
> the parser -- provided when the IO parser was created -- is freed before the
> close callback is invoked by calling xmlFreeTextReader. This is an error in
> this instance, because the context handle cannot simply be free()d, in our
> application it requires specific destructor work to occur. This might be a
> lack of undestanding of the purpose of the close callback, but it's clear
> that AXIS2_FREE is invoked on the context handle before the close callback is
> invoked.
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