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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-21166] Leak in getExecutorDistinct</title>
                <link>https://jira.mongodb.org/browse/SERVER-21166</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongod githash: 0613deff6f&lt;/p&gt;

&lt;p/&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;[MongoDFixture:job0] Direct leak of 200 byte(s) in 1 object(s) allocated from:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #0 0xae13c9 in operator new(unsigned long) (/home/ubuntu/mongo/mongod+0xae13c9)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #1 0x1c00d08 in mongo::getExecutorDistinct(mongo::OperationContext*, mongo::Collection*, std::string const&amp;amp;, mongo::BSONObj const&amp;amp;, std::string const&amp;amp;, bool, mongo::PlanExecutor::YieldPolicy) /home/ubuntu/mongo/src/mongo/db/query/get_executor.cpp:1363&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #2 0x118776d in mongo::DistinctCommand::getPlanExecutor(mongo::OperationContext*, mongo::Collection*, std::string const&amp;amp;, mongo::BSONObj const&amp;amp;, bool) const /home/ubuntu/mongo/src/mongo/db/commands/distinct.cpp:127&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #3 0x1181e67 in mongo::DistinctCommand::run(mongo::OperationContext*, std::string const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::string&amp;amp;, mongo::BSONObjBuilder&amp;amp;) /home/ubuntu/mongo/src/mongo/db/commands/distinct.cpp:170&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #4 0x13d4b30 in mongo::Command::run(mongo::OperationContext*, mongo::rpc::RequestInterface const&amp;amp;, mongo::rpc::ReplyBuilderInterface*) /home/ubuntu/mongo/src/mongo/db/dbcommands.cpp:1385&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #5 0x13cff9a in mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, mongo::rpc::RequestInterface const&amp;amp;, mongo::rpc::ReplyBuilderInterface*) /home/ubuntu/mongo/src/mongo/db/dbcommands.cpp:1290&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[MongoDFixture:job0]     #6 0x1122c11 in mongo::runCommands(mongo::OperationContext*, mongo::rpc::RequestInterface const&amp;amp;, mongo::rpc::ReplyBuilderInterface*) /home/ubuntu/mongo/src/mongo/db/commands.cpp:496&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="236434">SERVER-21166</key>
            <summary>Leak in getExecutorDistinct</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                            <label>fuzzer-blocker</label>
                    </labels>
                <created>Tue, 27 Oct 2015 18:24:45 +0000</created>
                <updated>Mon, 25 Apr 2016 02:50:02 +0000</updated>
                            <resolved>Thu, 29 Oct 2015 22:08:50 +0000</resolved>
                                    <version>3.2.0-rc1</version>
                                    <fixVersion>3.2.0-rc2</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1075237" author="xgen-internal-githook" created="Fri, 30 Oct 2015 14:36:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21166&quot; title=&quot;Leak in getExecutorDistinct&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21166&quot;&gt;&lt;del&gt;SERVER-21166&lt;/del&gt;&lt;/a&gt; better error message&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/89a4d15153c23050aeb08ba60955517d34ab8f60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/89a4d15153c23050aeb08ba60955517d34ab8f60&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1074734" author="xgen-internal-githook" created="Thu, 29 Oct 2015 22:07:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21166&quot; title=&quot;Leak in getExecutorDistinct&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21166&quot;&gt;&lt;del&gt;SERVER-21166&lt;/del&gt;&lt;/a&gt; validate that index key pattern values are representable as 32-bit signed numbers&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f95d12b1e033bc77713cabc32b51d0e2e347d828&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f95d12b1e033bc77713cabc32b51d0e2e347d828&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1074733" author="xgen-internal-githook" created="Thu, 29 Oct 2015 22:07:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21166&quot; title=&quot;Leak in getExecutorDistinct&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21166&quot;&gt;&lt;del&gt;SERVER-21166&lt;/del&gt;&lt;/a&gt; don&apos;t leak DistinctNode&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d75f311d37b5710421668425bbdf703c0b3324e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d75f311d37b5710421668425bbdf703c0b3324e7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1074457" author="david.storch" created="Thu, 29 Oct 2015 18:41:10 +0000"  >&lt;p&gt;The root cause of the leak is an unexpected exception being thrown by a &lt;tt&gt;verify()&lt;/tt&gt; tripped during query planning. We were leaking a raw pointer, so I&apos;ve changed the raw pointer to a unique_ptr in order to protect against any early return.&lt;/p&gt;

&lt;p&gt;I&apos;ve also fixed the &lt;tt&gt;verify()&lt;/tt&gt; failure, which is the underlying problem. Planning code is converting the value inside the index key pattern to a 32-bit signed int in order to determine whether the index is ascending or descending. If the value overflows these 32 bits, then the planner can misinterpret an ascending index as descending (or vice-versa). In order to protect against this scenario, I&apos;ve added validation which makes sure that the numeric value inside each key pattern element fits inside a 32-bit signed int.&lt;/p&gt;</comment>
                            <comment id="1071962" author="david.storch" created="Tue, 27 Oct 2015 18:41:43 +0000"  >&lt;p&gt;Looks like we&apos;re leaking the DistinctNode:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/28a2d6fa3f7fb6659f578d69e6d772ae9be8c25e/src/mongo/db/query/get_executor.cpp#L1363&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/28a2d6fa3f7fb6659f578d69e6d772ae9be8c25e/src/mongo/db/query/get_executor.cpp#L1363&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We should be managing the DistinctNode with a unique_ptr. However, a repro would be useful, since the call to analyzeDataAccess() is supposed to take ownership of the DistinctNode, and I&apos;m not sure how anything before then could throw.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="223747">SERVER-19712</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="236432">SERVER-21165</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="202764">SERVER-18372</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="237276">SERVER-21251</issuekey>
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