Greg Hildstrom authored Sep 04, 2018 and Nick Wellnhofer committed Sep 04, 2018

When reusing an xmlSchemaValidCtxtPtr to validate multiple xml documents
against the same schema, there is a memory leak in xmlschemas.c in
xmlSchemaClearValidCtxt(). The vctxt->idcKeys and associated counters
are not cleaned up in xmlSchemaClearValidCtxt() as they are in
xmlSchemaFreeValidCtxt(). As a result, vctxt->idcKeys grows with each
xmlValidateDoc() call that uses the same context and that memory is
never freed. Similarly, vctxt->nbIdcKeys and vctxt->sizeIdcKeys
increment and are never reset.

Closes: #23