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    <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-7787] linenoise_utf8.cpp can read uninitialized memory, trigger Valgrind</title>
                <link>https://jira.mongodb.org/browse/SERVER-7787</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The copyString32to8counted() routine reads a possible next 32-bit character from its input buffer before checking the count of characters.  When called with a non-NUL-terminated string, this character may be uninitialized, triggering tools such as Valgrind to report a problem.&lt;/p&gt;

&lt;p&gt;The count is then checked and the character is ignored if the count indicates that the character is not part of the string to be read, so this is harmless except in edge cases (at page boundaries with the following page an unmapped virtual address).&lt;/p&gt;

&lt;p&gt;The code should should check the count first.&lt;/p&gt;</description>
                <environment></environment>
        <key id="57747">SERVER-7787</key>
            <summary>linenoise_utf8.cpp can read uninitialized memory, trigger Valgrind</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="tad">Tad Marshall</assignee>
                                    <reporter username="tad">Tad Marshall</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Nov 2012 10:21:59 +0000</created>
                <updated>Mon, 11 Jul 2016 17:58:21 +0000</updated>
                            <resolved>Wed, 28 Nov 2012 12:55:12 +0000</resolved>
                                                    <fixVersion>2.2.3</fixVersion>
                    <fixVersion>2.3.2</fixVersion>
                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="233963" author="auto" created="Tue, 8 Jan 2013 08:56:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-11-28T10:22:34Z&apos;, u&apos;name&apos;: u&apos;Tad Marshall&apos;, u&apos;email&apos;: u&apos;tad@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7787&quot; title=&quot;linenoise_utf8.cpp can read uninitialized memory, trigger Valgrind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7787&quot;&gt;&lt;del&gt;SERVER-7787&lt;/del&gt;&lt;/a&gt; Do not read character before checking count&lt;/p&gt;

&lt;p&gt;Change the order of tests in copyString32to8counted() to check the count&lt;br/&gt;
of input characters before reading a possibly uninitialized character.&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c814cb28686e5336f3cbc3753dc120cbfc43a854&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c814cb28686e5336f3cbc3753dc120cbfc43a854&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="201105" author="auto" created="Wed, 28 Nov 2012 12:45:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-11-28T10:22:34Z&apos;, u&apos;email&apos;: u&apos;tad@10gen.com&apos;, u&apos;name&apos;: u&apos;Tad Marshall&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7787&quot; title=&quot;linenoise_utf8.cpp can read uninitialized memory, trigger Valgrind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7787&quot;&gt;&lt;del&gt;SERVER-7787&lt;/del&gt;&lt;/a&gt; Do not read character before checking count&lt;/p&gt;

&lt;p&gt;Change the order of tests in copyString32to8counted() to check the count&lt;br/&gt;
of input characters before reading a possibly uninitialized character.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2557e9af57142f8334330c956bdcc8fb1cf481ab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2557e9af57142f8334330c956bdcc8fb1cf481ab&lt;/a&gt;&lt;/p&gt;</comment>
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