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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85316] FeatureCompatibilityVersion static functions can access uninitialized optional</title>
                <link>https://jira.mongodb.org/browse/SERVER-85316</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;FeatureCompatibilityVersion::validateSetFeatureCompatibilityVersionRequest calls value() &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7974785e043ae881ca32ad154162194a85cd4936/src/mongo/db/commands/feature_compatibility_version.cpp#L326&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; on a boost::optional&amp;lt;BSONObj&amp;gt; it obtains from  FeatureCompatibilityVersion::findFeatureCompatibilityVersionDocument. &lt;/p&gt;

&lt;p&gt;findFeatureCompatabilityVersionDocument will return an uninitialized optional &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7974785e043ae881ca32ad154162194a85cd4936/src/mongo/db/commands/feature_compatibility_version.cpp#L307&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; if the underlying StorageInterface-&amp;gt;findById fails for any reason (for example, if the opCtx is killed due to repl state change). &lt;/p&gt;

&lt;p&gt;If we call value() on the optional when it is uninitialized, it will throw a boost::bad_optional_access exception, which is not caught in the server and will ultimately result in a server crash. We should check if the optional is none and propagate up a correct/useful error to the top layer.&lt;/p&gt;

&lt;p&gt; FeatureCompatibilityVersion::updateFeatureCompatibilityVersionDocument seems to have the same problem &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7974785e043ae881ca32ad154162194a85cd4936/src/mongo/db/commands/feature_compatibility_version.cpp#L429&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2547913">SERVER-85316</key>
            <summary>FeatureCompatibilityVersion static functions can access uninitialized optional</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="huayu.ouyang@mongodb.com">Huayu Ouyang</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                            <label>not-7.3-blocker</label>
                    </labels>
                <created>Wed, 17 Jan 2024 17:21:52 +0000</created>
                <updated>Mon, 5 Feb 2024 17:16:44 +0000</updated>
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