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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-51385] Ensure that vector is initialized before setting vector as output of std::transform</title>
                <link>https://jira.mongodb.org/browse/SERVER-51385</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are a few valid ways to output to a newly declared vector from std::transform. For example:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Initialize the vector to the size of the input, so that std::transform can properly index into each memory space, OR&lt;/li&gt;
	&lt;li&gt;Use std::back_inserter, which is an iterator that will call push_back on the output vector for each input element.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;If one attempts to use std::transform on an uninitialized vector &lt;em&gt;without&lt;/em&gt; using std::back_inserter, std::transform will induce a segfault attempting to index into memory that hasn&apos;t yet been allocated.&lt;/p&gt;

&lt;p&gt;This ticket is to fix &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9d86556d0032cdce4b1120c2390fd9b4f1232371/src/mongo/db/s/resharding/resharding_coordinator_service.cpp#L362-L366&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an instance of that bug&lt;/a&gt; in Resharding code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1503368">SERVER-51385</key>
            <summary>Ensure that vector is initialized before setting vector as output of std::transform</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>PM-234-M1</label>
                            <label>PM-234-T-lifecycle</label>
                    </labels>
                <created>Tue, 6 Oct 2020 13:20:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:18 +0000</updated>
                            <resolved>Wed, 7 Oct 2020 20:14:44 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3431801" author="xgen-internal-githook" created="Wed, 7 Oct 2020 16:16:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51385&quot; title=&quot;Ensure that vector is initialized before setting vector as output of std::transform&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51385&quot;&gt;&lt;del&gt;SERVER-51385&lt;/del&gt;&lt;/a&gt; Initialize vector with size before using as output of std::transform&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bcbebf4314d929e2708a58620e8d00c3de9958b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bcbebf4314d929e2708a58620e8d00c3de9958b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3428071" author="blake.oler" created="Tue, 6 Oct 2020 13:22:03 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=haley.connelly&quot; class=&quot;user-hover&quot; rel=&quot;haley.connelly&quot;&gt;haley.connelly&lt;/a&gt;. I had no idea this was a thing until today!&lt;/p&gt;</comment>
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            <issuekey id="1494823">SERVER-51209</issuekey>
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            <issuekey id="1494876">SERVER-51210</issuekey>
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