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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-26407] Segfault is possible in MigrationSourceManager when it calls css-&gt;getMetadata()-&gt;getCollVersion() and the collection was dropped since the migration began.</title>
                <link>https://jira.mongodb.org/browse/SERVER-26407</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The collection can be dropped if the balancer loses the distlock during the migration. Then drop can acquire the distlock and run during the migration.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/d6d5a9081c357df6149c10c296797ffd5339aa3f/src/mongo/db/s/migration_source_manager.cpp#L254&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This&lt;/a&gt; line of code,&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;css-&amp;gt;getMetadata()-&amp;gt;getCollVersion()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;can segfault. If the collection is not sharded (say it has been dropped), CollectionShardingState::get creates a CollectionShardingState, which creates an empty MetadataManager with no active metadata. When MetadataManager::getActiveMetadata (via css-&amp;gt;getMetadata) is called, it returns an empty ScopedCollectionMetadata object. Then when the ScopedCollectionMetadata object is dereferenced for getCollVersion, a nullptr is accessed.&lt;/p&gt;

&lt;p&gt;This might be solved by additionally checking that css-&amp;gt;getMetadata() returns true before proceeding with getCollVersion. css-&amp;gt;getMetadata() returns a ScopedCollectionMetadata, which has a bool operator function defined to return true if it actually has a CollectionMetadata.&lt;/p&gt;

&lt;p&gt;Should survey all of css-&amp;gt;getMetadata usages to make use they won&apos;t segfault.&lt;/p&gt;

&lt;p&gt;Further check in other places in MigrationSourceManager that the collection has not been dropped or recreated (it would have a different epoch in the version).&lt;/p&gt;</description>
                <environment></environment>
        <key id="320094">SERVER-26407</key>
            <summary>Segfault is possible in MigrationSourceManager when it calls css-&gt;getMetadata()-&gt;getCollVersion() and the collection was dropped since the migration began.</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="9">Done</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Sep 2016 14:39:43 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:08 +0000</updated>
                            <resolved>Wed, 5 Oct 2016 14:51:06 +0000</resolved>
                                                    <fixVersion>3.4.0-rc1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1400752" author="xgen-internal-githook" created="Wed, 5 Oct 2016 14:37:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26407&quot; title=&quot;Segfault is possible in MigrationSourceManager when it calls css-&amp;gt;getMetadata()-&amp;gt;getCollVersion() and the collection was dropped since the migration began.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26407&quot;&gt;&lt;del&gt;SERVER-26407&lt;/del&gt;&lt;/a&gt; Prevent segfaults in MigrationSourceManager due to dropped collection and empty chunk metadata objects&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46b60fc18b9b9d8ac48216e55e9503f2e4a6ad5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46b60fc18b9b9d8ac48216e55e9503f2e4a6ad5b&lt;/a&gt;&lt;/p&gt;</comment>
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