Description:
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The query string of an FPM request is copied unescaped into the JSON output. If the query string contains an unescaped double quote, this causes invalid JSON to be output.

The query string is correctly escaped when output as HTML or XML, this needs extending to JSON:

https://github.com/php/php-src/blob/PHP-5.4.22/sapi/fpm/fpm/fpm_status.c#L421

Test script:
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Note that most browsers will urlencode double quotes automatically so CURL (or equivalent) should be used to test.

curl 'http://localhost/sleep.php?test"foo' &

curl 'http://localhost/fpmstatus.php?json&full'


Expected result:
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..."request uri":"/sleep.php?test\"foo"...

Actual result:
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..."request uri":"/sleep.php?test"foo"...