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From "Charles Sanders (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-13185) NPE in query parsing because of missing null check
Date Mon, 06 May 2019 12:33:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-13185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16833765#comment-16833765
] 

Charles Sanders commented on SOLR-13185:
----------------------------------------

Added new patch which includes a unit test

> NPE in query parsing because of missing null check
> --------------------------------------------------
>
>                 Key: SOLR-13185
>                 URL: https://issues.apache.org/jira/browse/SOLR-13185
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: query parsers
>    Affects Versions: master (9.0)
>         Environment: h1. Steps to reproduce
> * Use a Linux machine.
> *  Build commit {{ea2c8ba}} of Solr as described in the section below.
> * Build the films collection as described below.
> * Start the server using the command {{./bin/solr start -f -p 8983 -s /tmp/home}}
> * Request the URL given in the bug description.
> h1. Compiling the server
> {noformat}
> git clone https://github.com/apache/lucene-solr
> cd lucene-solr
> git checkout ea2c8ba
> ant compile
> cd solr
> ant server
> {noformat}
> h1. Building the collection
> We followed [Exercise 2|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html#exercise-2]
from the [Solr Tutorial|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html]. The attached
file ({{home.zip}}) gives the contents of folder {{/tmp/home}} that you will obtain by following
the steps below:
> {noformat}
> mkdir -p /tmp/home
> echo '<?xml version="1.0" encoding="UTF-8" ?><solr></solr>' > /tmp/home/solr.xml
> {noformat}
> In one terminal start a Solr instance in foreground:
> {noformat}
> ./bin/solr start -f -p 8983 -s /tmp/home
> {noformat}
> In another terminal, create a collection of movies, with no shards and no replication,
and initialize it:
> {noformat}
> bin/solr create -c films
> curl -X POST -H 'Content-type:application/json' --data-binary '{"add-field": {"name":"name",
"type":"text_general", "multiValued":false, "stored":true}}' http://localhost:8983/solr/films/schema
> curl -X POST -H 'Content-type:application/json' --data-binary '{"add-copy-field" : {"source":"*","dest":"_text_"}}'
http://localhost:8983/solr/films/schema
> ./bin/post -c films example/films/films.json
> {noformat}
>            Reporter: Johannes Kloos
>            Priority: Minor
>              Labels: diffblue, newdev
>         Attachments: SOLR-13185.patch, SOLR-13185.patch, home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?defType=complexphrase&q.op=AND
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> java.lang.NullPointerException
> at java.io.StringReader.<init>(StringReader.java:50)
> at org.apache.lucene.queryparser.classic.QueryParserBase.parse(QueryParserBase.java:106)
> at org.apache.lucene.queryparser.complexPhrase.ComplexPhraseQueryParser.parse(ComplexPhraseQueryParser.java:125)
> at org.apache.solr.search.ComplexPhraseQParserPlugin$ComplexPhraseQParser.parse(ComplexPhraseQParserPlugin.java:164)
> at org.apache.solr.search.QParser.getQuery(QParser.java:173)
> at org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:158)
> [...]
> {noformat}
> What happens here is that a querystring (qstr) is passed into a StringReader. Ultimately,
this query string comes from the method o.a.s.h.c.QueryComponent, in method prepare (line
157), where it is extracted using rb.queryString() [rb is of type responseBuffer]. The query
string stored in the response buffer was earlier on extracted from the request URL by looking
for the "q" parameter; note that this parameter is absent in the example request, so qstr
would be null. The extracted qstr is then passed to QParser.getParser, which expects a non-null
query string.
> We found this bug using [Diffblue Microservices Testing|https://www.diffblue.com/labs/].
Find more information on this [fuzz testing campaign|https://www.diffblue.com/blog/2018/12/19/diffblue-microservice-testing-a-sneak-peek-at-our-early-product-and-results].



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