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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>
    </build-info>


<item>
            <title>[SERVER-22702] The $push modifier exhibits UB when validating the $position field</title>
                <link>https://jira.mongodb.org/browse/SERVER-22702</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The problematic code is here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/95ca58f7396c1c4e1c5e54caa81dda875ca87b57/src/mongo/db/ops/modifier_push.cpp#L322-L325&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/95ca58f7396c1c4e1c5e54caa81dda875ca87b57/src/mongo/db/ops/modifier_push.cpp#L322-L325&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;However, the entire validation block looks suspect and should probably be refactored.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;  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;(/home/andrew/Documents/10gen/dev/src/mongodb/build/optdebug/mongo/db/ops/modifier_push_test+0x5c5561): runtime error: value 9e+19 is outside the range of representable values of type &apos;long&apos;&lt;/span&gt;&lt;/pre&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;    #0 0x6ba3ad in mongo::ModifierPush::init(mongo::BSONElement const&amp;amp;, mongo::ModifierInterface::Options const&amp;amp;, bool*) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/ops/modifier_push.cpp:322:46&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;    #1 0x5cdfe1 in (anonymous namespace)::UnitTest__ToPosition__BadInputs::_doTest() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/ops/modifier_push_test.cpp:1292:9&lt;/span&gt;&lt;/pre&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;    #2 0x6e49c8 in mongo::unittest::Test::run() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.cpp:147:9&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;    #3 0x5cdccf in void mongo::unittest::Suite::runTestObject&amp;lt;(anonymous namespace)::UnitTest__ToPosition__BadInputs&amp;gt;() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.h:405:9&lt;/span&gt;&lt;/pre&gt;
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					&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;    #4 0x6e615d in mongo::unittest::TestHolder::run() const /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.h:257:9&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;    #5 0x6e615d in mongo::unittest::Suite::run(std::string const&amp;amp;, int) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.cpp:263&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;    #6 0x6e7627 in mongo::unittest::Suite::run(std::vector&amp;lt;std::string, std::allocator&amp;lt;std::string&amp;gt; &amp;gt; const&amp;amp;, std::string const&amp;amp;, int) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.cpp:321:27&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;    #7 0x6ecd47 in main /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest_main.cpp:40:12&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;    #8 0x7f7c49d6ba3f in __libc_start_main /build/buildd/glibc-2.21/csu/libc-start.c:289&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;   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;    #9 0x5af0c8 in _start (/home/andrew/Documents/10gen/dev/src/mongodb/build/optdebug/mongo/db/ops/modifier_push_test+0x5af0c8)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="266247">SERVER-22702</key>
            <summary>The $push modifier exhibits UB when validating the $position field</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                            <label>undefined-sanitizer</label>
                    </labels>
                <created>Wed, 17 Feb 2016 19:53:22 +0000</created>
                <updated>Wed, 16 Mar 2016 20:30:41 +0000</updated>
                            <resolved>Wed, 24 Feb 2016 14:59:31 +0000</resolved>
                                                    <fixVersion>3.3.3</fixVersion>
                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1183133" author="tess.avitabile" created="Wed, 24 Feb 2016 14:59:31 +0000"  >&lt;p&gt;Previously a the $position field for the $push modifier was required to be representable as a 64-bit integer. Now it is required to be representable as a 32-bit integer.&lt;/p&gt;</comment>
                            <comment id="1183128" author="xgen-internal-githook" created="Wed, 24 Feb 2016 14:57:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tessavitabile&apos;, u&apos;name&apos;: u&apos;Tess Avitabile&apos;, u&apos;email&apos;: u&apos;tess.avitabile@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22702&quot; title=&quot;The $push modifier exhibits UB when validating the $position field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22702&quot;&gt;&lt;del&gt;SERVER-22702&lt;/del&gt;&lt;/a&gt; Clean up push position validation and eliminate UB&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/08643f4ff5107be79c65de89773d91e7d616f9d5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/08643f4ff5107be79c65de89773d91e7d616f9d5&lt;/a&gt;&lt;/p&gt;</comment>
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