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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-1860] BufBuilder copy, assignment memory double-frees memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-1860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This code issue is minor because it is not currently triggered by existing code.&lt;/p&gt;

&lt;p&gt;StringBuilder uses a BufBuilder (bson/util/builder.h) to manually manage a char buffer. The default copy constructor and operator= will shallow copy the data pointer, which will ultimately lead to freeing the memory multiple times. You can produce the issue with:&lt;br/&gt;
{&lt;br/&gt;
  StringBuffer a;&lt;br/&gt;
  &lt;/p&gt;
{
    StringBuffer b=a;
  }
&lt;p&gt; // b d&apos;tor frees b.data, which == a.data&lt;br/&gt;
  &lt;/p&gt;
{
    StringBuffer c(a);
  }
&lt;p&gt; // c d&apos;tor frees a.data again&lt;/p&gt;

&lt;p&gt;} // a d&apos;tor frees a.data again&lt;/p&gt;</description>
                <environment></environment>
        <key id="13195">SERVER-1860</key>
            <summary>BufBuilder copy, assignment memory double-frees memory</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="alerner">Alberto Lerner</assignee>
                                    <reporter username="akatayls">Matt Taylor</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Sep 2010 18:48:13 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:27 +0000</updated>
                            <resolved>Mon, 27 Sep 2010 20:51:06 +0000</resolved>
                                                    <fixVersion>1.7.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="18667" author="akatayls" created="Wed, 29 Sep 2010 17:40:21 +0000"  >&lt;p&gt;I did the same for BufBuilder (used by StringBuilder to manage char buffer), and made kill() private because it invalidates the object&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://github.com/tayls/mongo/commit/03861eaf216c678b4b7d6caaf1ef0446f6e00afd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/tayls/mongo/commit/03861eaf216c678b4b7d6caaf1ef0446f6e00afd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="18592" author="alerner" created="Mon, 27 Sep 2010 20:49:17 +0000"  >&lt;p&gt;Matt, the class is better left non-copyable. But it&apos;s true that code like that should not shallow copy silently. I made the class explicitly non-copyable.&lt;/p&gt;</comment>
                            <comment id="18591" author="auto" created="Mon, 27 Sep 2010 20:48:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1860&quot; title=&quot;BufBuilder copy, assignment memory double-frees memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1860&quot;&gt;&lt;del&gt;SERVER-1860&lt;/del&gt;&lt;/a&gt; Stringbuilder is non-copyable&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/4b56d14a15baf9853df4c74a5fcfa0c32845842b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/4b56d14a15baf9853df4c74a5fcfa0c32845842b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="18576" author="akatayls" created="Mon, 27 Sep 2010 20:14:50 +0000"  >&lt;p&gt;Issues can be fixed by pulling &lt;a href=&quot;http://github.com/tayls/mongo/commit/e9b10a49d39200c3c97c48bbd0728b9fd7330d6f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/tayls/mongo/commit/e9b10a49d39200c3c97c48bbd0728b9fd7330d6f&lt;/a&gt;&lt;/p&gt;</comment>
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