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    <title>MongoDB Jira</title>
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    <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-50193] Coverity analysis defect 116145: Out-of-bounds access</title>
                <link>https://jira.mongodb.org/browse/SERVER-50193</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Out-of-bounds access&lt;/p&gt;

&lt;p&gt; Memory not owned by this buffer will be accessed, causing memory corruption or incorrect computations. Access of memory past the end of a memory buffer&lt;br/&gt;
/src/mongo/db/exec/sbe/values/value.cpp:191: ARRAY_VS_SINGLETON 116145 Taking address with &quot;val&quot; yields a singleton pointer.&lt;br/&gt;
/src/mongo/db/exec/sbe/values/value.cpp:191: ARRAY_VS_SINGLETON 116145 Assigning: &quot;&amp;lt;temporary&amp;gt;&quot; = &quot;mongo::sbe::value::getSmallStringView(val)&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1436085">SERVER-50193</key>
            <summary>Coverity analysis defect 116145: Out-of-bounds access</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="13202">Works as Designed</resolution>
                                        <assignee username="anton.korshunov@mongodb.com">Anton Korshunov</assignee>
                                    <reporter username="xgen-internal-coverity">Coverity Collector User</reporter>
                        <labels>
                            <label>coverity</label>
                            <label>qexec-team</label>
                    </labels>
                <created>Sat, 8 Aug 2020 18:13:14 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:45 +0000</updated>
                            <resolved>Mon, 17 Aug 2020 20:09:41 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3342198" author="anton.korshunov" created="Mon, 17 Aug 2020 13:18:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt; Correct, for strings &amp;lt;= 7 characters we store it directly in a unit64_t Value, so this code fragment is legit. Marking it as Intentional.&lt;/p&gt;</comment>
                            <comment id="3341075" author="bernard.gorman" created="Sat, 15 Aug 2020 11:34:39 +0000"  >&lt;p&gt;Coverity is complaining that &lt;tt&gt;getSmallStringView&lt;/tt&gt; returns a &lt;tt&gt;char*&lt;/tt&gt; to the &lt;b&gt;address of&lt;/b&gt; the passed &lt;tt&gt;uint64_t Value&lt;/tt&gt;, and then treats that &lt;tt&gt;char*&lt;/tt&gt; as an &quot;array&quot; for the purposes of constructing a debug string - in contrast to e.g. &lt;tt&gt;getBigStringView&lt;/tt&gt;, which directly reinterprets the &lt;tt&gt;uint64_t Value&lt;/tt&gt; as a &lt;tt&gt;char*&lt;/tt&gt;. My assumption is that in the case of &lt;tt&gt;TypeTags::StringSmall&lt;/tt&gt;, the &lt;tt&gt;uint64_t Value&lt;/tt&gt; actually contains a string of &amp;lt;= 7 characters, while for &lt;tt&gt;TypeTags::StringBig&lt;/tt&gt; the &lt;tt&gt;uint64_t Value&lt;/tt&gt; is the address of the string in memory.&lt;/p&gt;

&lt;p&gt;Passing this over to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; to confirm. If this isn&apos;t actually a bug, please mark it as Classification: Intentional and Action: Ignore.&lt;/p&gt;</comment>
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