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From "Will Currie (JIRA)" <>
Subject [jira] [Commented] (SOLR-11512) Infinite parsing loop possible with edismax bq and local-params
Date Tue, 24 Oct 2017 06:39:00 GMT


Will Currie commented on SOLR-11512:

Thanks for following up. I doubt the query I supplied makes any sense. I ended up accidentally
triggering this loop whilst testing that xmlparser was (somewhat) disabled using the suggestion:
<queryParser name="xmlparser" class="solr.ExtendedDismaxQParserPlugin" />
When I tried the query "{!xmlparser v=DOCTYPE stuff}"" it got rewritten to edismax and spun
on cpu. I was kinda surprised to find you can't disable the {! syntax.

> Infinite parsing loop possible with edismax bq and local-params
> ---------------------------------------------------------------
>                 Key: SOLR-11512
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 7.1
>            Reporter: Will Currie
>            Priority: Minor
>         Attachments: SOLR-11512.patch
> The following query against the techproducts example puts solr into an infinite loop:
> {noformat}
> curl -g -v 'http://localhost:8983/solr/techproducts/select?q=*&defType=edismax&qq={!edismax+v=something}&bq={!edismax+v=$qq}
> {noformat}
> Problem doesn't depend on the collection, just an easy example. I guess I'd expect a
failure with "Infinite Recursion detected parsing query ..." instead. So depending on the
query config a user typing {!edismax v=whatever} into a search box can send a solr instance
to 100% cpu.
> I can reproduce using TestExtendedDismaxParser by adding:
> {code}
>   @Test
>   public void loopsForever() throws Exception {
>     assertJQ(req("defType", "edismax", "q", "*", "qq", "{!edismax v=something}", "bq",
"{!edismax v=$qq}"));
>   }
> {code}
> The code seems to hit QParser.checkRecurse() and try to fail but something sends it around
for another try. Repeat.
> Given the complexity of the parsing code there may well be other examples. There's no
way to disable the local params syntax is there? Question was asked in SOLR-4197.

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