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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-21641] Coverity analysis defect 76766: Out-of-bounds access</title>
                <link>https://jira.mongodb.org/browse/SERVER-21641</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Out-of-bounds access to a buffer&lt;/p&gt;

&lt;p&gt;Defect 76766 (STATIC_C)&lt;br/&gt;
  Checker OVERRUN (subcategory none)&lt;br/&gt;
  File:  &lt;tt&gt;/src/third_party/wiredtiger/src/cursor/cur_join.c&lt;/tt&gt;&lt;br/&gt;
  Function &lt;tt&gt;__curjoin_entry_iter_init&lt;/tt&gt;&lt;br/&gt;
    /src/third_party/wiredtiger/src/cursor/cur_join.c, line: 40&lt;br/&gt;
    &lt;font color=&quot;red&quot;&gt;Assigning: &quot;config&quot; = &quot;&amp;amp;def_cfg&lt;span class=&quot;error&quot;&gt;&amp;#91;0&amp;#93;&lt;/span&gt;&quot;. &quot;config&quot; now points to element 0 of &quot;def_cfg&quot; (which consists of 2 8-byte elements).&lt;/font&gt; &lt;/p&gt;
&lt;p/&gt;
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                <environment></environment>
        <key id="240789">SERVER-21641</key>
            <summary>Coverity analysis defect 76766: Out-of-bounds access</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="keith.bostic@mongodb.com">Keith Bostic</assignee>
                                    <reporter username="xgen-internal-coverity">Coverity Collector User</reporter>
                        <labels>
                            <label>coverity</label>
                    </labels>
                <created>Mon, 23 Nov 2015 20:56:07 +0000</created>
                <updated>Sun, 29 Nov 2015 23:16:39 +0000</updated>
                            <resolved>Wed, 25 Nov 2015 14:11:45 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1098246" author="xgen-internal-githook" created="Wed, 25 Nov 2015 14:24:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;keithbostic&apos;, u&apos;name&apos;: u&apos;Keith Bostic&apos;, u&apos;email&apos;: u&apos;keith@wiredtiger.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21641&quot; title=&quot;Coverity analysis defect 76766: Out-of-bounds access&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21641&quot;&gt;&lt;del&gt;SERVER-21641&lt;/del&gt;&lt;/a&gt;.  Resolve Coverity complaint.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit c9907c6289d81d79266f4e2ccd34c84c6bf19783.&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/1e094eeee8e353e93bf800ae4f897449b72adece&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/1e094eeee8e353e93bf800ae4f897449b72adece&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1098245" author="xgen-internal-githook" created="Wed, 25 Nov 2015 14:24:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ddanderson&apos;, u&apos;name&apos;: u&apos;Don Anderson&apos;, u&apos;email&apos;: u&apos;dda@ddanderson.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21641&quot; title=&quot;Coverity analysis defect 76766: Out-of-bounds access&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21641&quot;&gt;&lt;del&gt;SERVER-21641&lt;/del&gt;&lt;/a&gt;.  Resolve Coverity complaint.&lt;br/&gt;
Presumably __wt_config_gets_def&apos;s (conditional) reference of cfg&lt;span class=&quot;error&quot;&gt;&amp;#91;2&amp;#93;&lt;/span&gt; means&lt;br/&gt;
that cfg strings are de facto required to have at least 3 entries.&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/c9907c6289d81d79266f4e2ccd34c84c6bf19783&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/c9907c6289d81d79266f4e2ccd34c84c6bf19783&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1098238" author="keith.bostic" created="Wed, 25 Nov 2015 14:11:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xgen-internal-coverity&quot; class=&quot;user-hover&quot; rel=&quot;xgen-internal-coverity&quot;&gt;xgen-internal-coverity&lt;/a&gt;, this defect is a false positive. Coverity doesn&apos;t like code that looks like this:&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;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;const char *cfg[] = { &quot;xxx&quot;, NULL };&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;if (cfg == NULL || cfg[0] == NULL || cfg[1] == NULL)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;        return (0);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;if (cfg[2] == NULL) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;        WT_RET_NOTFOUND_OK(&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;            __wt_config_getones(session, cfg[1], key, value));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;        return (0);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Coverity complains that &lt;tt&gt;cfg[2]&lt;/tt&gt; is an out-of-bounds access, and unfortunately, WiredTiger uses this construct all over the place.&lt;/p&gt;

&lt;p&gt;If there were some way to rewrite this so Coverity would quit complaining, that would be great.&lt;/p&gt;</comment>
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                            <issuelinktype id="10011">
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="241252">SERVER-21686</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
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            <issuekey id="240709">WT-2234</issuekey>
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