Cesar Rodriguez created SOLR-13183:
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Summary: NullPointerException at
o.a.solr.servlet.SolrDispatchFilter.doFilter
Key: SOLR-13183
URL: https://issues.apache.org/jira/browse/SOLR-13183
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
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: Cesar Rodriguez
Attachments: home.zip
Requesting the following URL causes Solr to return an HTTP 500 error response:
{noformat}
http://localhost:8983/solr/films/schema/%25
{noformat}
The error response seems to be caused by the following uncaught exception:
{noformat}
java.lang.NullPointerException
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:403)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:340)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
[...]
{noformat}
Function SolrDisplatchFilter.doFilter(), line 403 calls methods forward() on a
null pointer. The problem happens because
ServletRequestWrapper.getRequestDispatcher(), line 338 returns null. And that
happens because
org.eclipse.jetty.server.handler.ContextHandler.Context.getRequestDispatcher()
returns a null pointer. This happens because
org.eclipse.jetty.http.HttpURI.getDecodedPath() tries to decode the string
{{/solr/films/schema/%}}, which is an invalid encoding.
I don’t fully follow the logic of the code but it seems that the
percent-encoding of the URL has first been decoded and then it’s being decoded
again?
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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