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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-8861] GeoSearch::expandEndPoints can elicit --multiset::begin()</title>
                <link>https://jira.mongodb.org/browse/SERVER-8861</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In GeoSearch::expandEndPoints there is an iterator decrement that can synthesize an iterator equivalent to --multiset::begin():&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/18de1d56412bfb89a6b3f95b18eeb770184fda15/src/mongo/db/geo/2d.cpp#L1823&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/18de1d56412bfb89a6b3f95b18eeb770184fda15/src/mongo/db/geo/2d.cpp#L1823&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is illegal in C+&lt;ins&gt;11 even if the iterator is never dereferenced since one of the prerequisites for operator--() on a BidirectionalIterator &apos;r&apos; is that there exists &apos;s&apos; such that r == ++s, and there is no such &apos;s&apos; for r == begin() &lt;span class=&quot;error&quot;&gt;&amp;#91;24.2.6&amp;#93;&lt;/span&gt;. This causes a crash when mongo is built against libc&lt;/ins&gt;+.&lt;/p&gt;

&lt;p&gt;Need to check C++98 to know for sure that this is illegal there (I&apos;d guess it is), but it seems safer to not form the potentially illegal iterator anyway.&lt;/p&gt;</description>
                <environment></environment>
        <key id="67411">SERVER-8861</key>
            <summary>GeoSearch::expandEndPoints can elicit --multiset::begin()</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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                            <label>crash</label>
                            <label>geo</label>
                    </labels>
                <created>Tue, 5 Mar 2013 20:25:28 +0000</created>
                <updated>Mon, 11 Jul 2016 17:56:51 +0000</updated>
                            <resolved>Sat, 16 Mar 2013 16:57:16 +0000</resolved>
                                    <version>2.4.0-rc2</version>
                                    <fixVersion>2.5.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="290630" author="auto" created="Sat, 16 Mar 2013 00:30:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-03-13T22:49:18Z&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8861&quot; title=&quot;GeoSearch::expandEndPoints can elicit --multiset::begin()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8861&quot;&gt;&lt;del&gt;SERVER-8861&lt;/del&gt;&lt;/a&gt; Avoid forming iterator to before begin&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a60108e953f2b20a6803466f2b622ae9f4b77ede&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a60108e953f2b20a6803466f2b622ae9f4b77ede&lt;/a&gt;&lt;/p&gt;</comment>
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