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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-36546] Buffer overflow in WTUniqueIndex cursor restore</title>
                <link>https://jira.mongodb.org/browse/SERVER-36546</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A unique index cursor &lt;tt&gt;restore&lt;/tt&gt; could return a key shorter than the current key. I such a case comparing&#160; the current key with the restored key could cause a buffer overflow.&lt;/p&gt;

&lt;p&gt;The evergreen run reporting this memory leak:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_ubuntu1604_debug_aubsan_async_sharding_op_query_4e57f57add2ad51a1c8cafd3fa05ec50b6437797_18_08_06_05_51_51/0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/mongodb_mongo_master_ubuntu1604_debug_aubsan_async_sharding_op_query_4e57f57add2ad51a1c8cafd3fa05ec50b6437797_18_08_06_05_51_51/0&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="585734">SERVER-36546</key>
            <summary>Buffer overflow in WTUniqueIndex cursor restore</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="neha.khatri">Neha Khatri</assignee>
                                    <reporter username="neha.khatri">Neha Khatri</reporter>
                        <labels>
                            <label>nonnyc</label>
                            <label>storage-engines</label>
                    </labels>
                <created>Wed, 8 Aug 2018 23:49:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:07 +0000</updated>
                            <resolved>Mon, 13 Aug 2018 23:50:09 +0000</resolved>
                                    <version>4.1.1</version>
                                    <fixVersion>4.1.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1974814" author="xgen-internal-githook" created="Mon, 13 Aug 2018 23:43:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;nehakhatri5&apos;, &apos;email&apos;: &apos;neha.khatri@mongodb.com&apos;, &apos;name&apos;: &apos;nehakhatri5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36546&quot; title=&quot;Buffer overflow in WTUniqueIndex cursor restore&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36546&quot;&gt;&lt;del&gt;SERVER-36546&lt;/del&gt;&lt;/a&gt; Be more cautious with key comparision during cursor restore.&lt;/p&gt;

&lt;p&gt;The new format unique indexes &lt;b&gt;do&lt;/b&gt; include the record id in their&lt;br/&gt;
KeyStrings. This means that restoring to the same key with a new&lt;br/&gt;
record id &lt;b&gt;should&lt;/b&gt; return false so that we will skip the key with the new&lt;br/&gt;
record-id. To enable this we compare the current key with the key&lt;br/&gt;
at the saved position. This comparision should be done only if the&lt;br/&gt;
saved key has a size greater than or equal to the key being compared.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ad1107c0daf14c4d2a457bf6fd89d41efe58e5b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ad1107c0daf14c4d2a457bf6fd89d41efe58e5b4&lt;/a&gt;&lt;/p&gt;</comment>
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