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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-18327] Coverity analysis defect 72086: Unchecked dynamic_cast</title>
                <link>https://jira.mongodb.org/browse/SERVER-18327</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Dynamic_cast may fail and return null if the type cast is incompatible&lt;/p&gt;

&lt;p&gt;Defect 72086 (STATIC_C)&lt;br/&gt;
  Checker FORWARD_NULL (subcategory dynamic_cast)&lt;br/&gt;
  File:  &lt;tt&gt;/src/mongo/db/matcher/expression_algo.cpp&lt;/tt&gt;&lt;br/&gt;
  Function &lt;tt&gt;mongo::expression::isClauseRedundant(const mongo::MatchExpression *, const mongo::MatchExpression *)&lt;/tt&gt;&lt;br/&gt;
    /src/mongo/db/matcher/expression_algo.cpp, line: 279&lt;br/&gt;
    &lt;font color=&quot;red&quot;&gt;Dynamic cast to pointer &quot;dynamic_cast &amp;lt;mongo::ExistsMatchExpression const *&amp;gt;(bar)&quot; can return &quot;NULL&quot;.&lt;/font&gt; &lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                    const ExistsMatchExpression* b = dynamic_cast&amp;lt;const ExistsMatchExpression*&amp;gt;(bar);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;    /src/mongo/db/matcher/expression_algo.cpp, line: 279&lt;br/&gt;
    &lt;font color=&quot;red&quot;&gt;Assigning: &quot;b&quot; = &quot;dynamic_cast &amp;lt;mongo::ExistsMatchExpression const *&amp;gt;(bar)&quot;.&lt;/font&gt; &lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                    const ExistsMatchExpression* b = dynamic_cast&amp;lt;const ExistsMatchExpression*&amp;gt;(bar);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;    /src/mongo/db/matcher/expression_algo.cpp, line: 281&lt;br/&gt;
    &lt;font color=&quot;red&quot;&gt;Passing null pointer &quot;b&quot; to &quot;path&quot;, which dereferences it. (The dereference happens because this is a virtual function call.)&lt;/font&gt; &lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                    return a-&amp;gt;path() == b-&amp;gt;path();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
</description>
                <environment></environment>
        <key id="202079">SERVER-18327</key>
            <summary>Coverity analysis defect 72086: Unchecked dynamic_cast</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="xgen-internal-coverity">Coverity Collector User</reporter>
                        <labels>
                            <label>coverity</label>
                    </labels>
                <created>Tue, 5 May 2015 13:10:12 +0000</created>
                <updated>Thu, 14 Apr 2016 15:19:25 +0000</updated>
                            <resolved>Thu, 14 May 2015 22:47:48 +0000</resolved>
                                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="914720" author="max.hirschhorn@10gen.com" created="Thu, 14 May 2015 22:47:48 +0000"  >&lt;p&gt;Replaced &lt;tt&gt;dynamic_cast&lt;/tt&gt; with &lt;tt&gt;static_cast&lt;/tt&gt; as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18350&quot; title=&quot;Add special handling of NaN for whether query can be answered by a partial index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18350&quot;&gt;&lt;del&gt;SERVER-18350&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="905222" author="milkie" created="Tue, 5 May 2015 13:13:13 +0000"  >&lt;p&gt;Either call dynamic_cast and check for null, or use static_cast.  It&apos;s pointless to use dynamic_cast if you don&apos;t check for null.&lt;/p&gt;</comment>
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            <issuekey id="193681">SERVER-17858</issuekey>
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