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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-79328] Decorable refactor UBSAN fix: pass void* for backlinks</title>
                <link>https://jira.mongodb.org/browse/SERVER-79328</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78390&quot; title=&quot;Decorable subsystem refactoring&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78390&quot;&gt;&lt;del&gt;SERVER-78390&lt;/del&gt;&lt;/a&gt; has a UBSAN true positive. It&apos;s not a runtime problem.&lt;/p&gt;

&lt;p&gt;We&apos;re downcasting a &quot;this&quot; pointer to its CRTP descendent in its CRTP base constructor, and the object is not yet an instance of that CRTP descendent, so this is incorrect. The backlink pointer is all reinterpret casts and lowlevel memory hacking anyway, so we can just pass a void* for this purpose and UBSAN has nothing to complain about. The downcast isn&apos;t needed until decoration.owner is called, which should be after the owner is constructed, and the downcast will be valid.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2400519">SERVER-79328</key>
            <summary>Decorable refactor UBSAN fix: pass void* for backlinks</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Jul 2023 18:37:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:28 +0000</updated>
                            <resolved>Thu, 27 Jul 2023 16:49:37 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5594334" author="xgen-internal-githook" created="Thu, 27 Jul 2023 02:41:17 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79328&quot; title=&quot;Decorable refactor UBSAN fix: pass void* for backlinks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79328&quot;&gt;&lt;del&gt;SERVER-79328&lt;/del&gt;&lt;/a&gt; Decorable USBSAN fix: pass void* to _setBackLink&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dc96dacc03d401b99ee624dd84fa8b589f2d07e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dc96dacc03d401b99ee624dd84fa8b589f2d07e7&lt;/a&gt;&lt;/p&gt;</comment>
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