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    <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-55054] Unchecked boost::optional usage in DocumentSourceInternalSetWindowFields</title>
                <link>https://jira.mongodb.org/browse/SERVER-55054</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/db2e46857ce1c2bf90fda9842287cc5940fce81c/src/mongo/db/pipeline/document_source_set_window_fields.cpp#L283&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This line&lt;/a&gt; in DocumentSourceInternalSetWindowFields::doGetNext() calls the [] overload on a PartitionIterator but then calls the get() method on the resulting optional without checking if it is boost::none. The [] overload can return boost::none, however, resulting in access to uninitialized memory and potential crashes.&lt;/p&gt;

&lt;p&gt;The simplest case I found where this happens is when there are no input documents to the $setWindowFields stage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1644061">SERVER-55054</key>
            <summary>Unchecked boost::optional usage in DocumentSourceInternalSetWindowFields</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="13201">Fixed</resolution>
                                        <assignee username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Mar 2021 00:19:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:32 +0000</updated>
                            <resolved>Tue, 9 Mar 2021 23:17:42 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3655858" author="xgen-internal-githook" created="Tue, 9 Mar 2021 22:44:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nick Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55054&quot; title=&quot;Unchecked boost::optional usage in DocumentSourceInternalSetWindowFields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55054&quot;&gt;&lt;del&gt;SERVER-55054&lt;/del&gt;&lt;/a&gt; Handle zero input documents in $setWindowFields stage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3e4f8585dea5f0c29509643a72664aa30ef4d149&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3e4f8585dea5f0c29509643a72664aa30ef4d149&lt;/a&gt;&lt;/p&gt;</comment>
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