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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>[DRIVERS-2154] BSON corpus: another test case for subdocuments that are too short</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-2154</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>&lt;p&gt;This applies to the BSON Corpus spec: &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/bson-corpus/bson-corpus.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/blob/master/source/bson-corpus/bson-corpus.rst&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The folllowing test case unveiled a bug in PyMongo&apos;s array decoding: &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/bson-corpus/tests/array.json#L34-L37&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/blob/master/source/bson-corpus/tests/array.json#L34-L37&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;PyMongo validates the array&apos;s size by looking at the int32 preceding the array, grabbing the byte at that offset from the current position, then checking to see if it&apos;s &lt;tt&gt;0x00&lt;/tt&gt;: &lt;a href=&quot;https://github.com/mongodb/mongo-python-driver/blob/3.3.0/bson/__init__.py#L158-L161&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-python-driver/blob/3.3.0/bson/__init__.py#L158-L161&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The interesting thing about the above test case is that the byte at that position &lt;b&gt;is&lt;/b&gt; &lt;tt&gt;0x00&lt;/tt&gt;. PyMongo happily accepts such an array without raising an error, even though the &lt;tt&gt;0x00&lt;/tt&gt; byte is part of the field value, not the terminator for the array.&lt;/p&gt;

&lt;p&gt;PyMongo has the same problem when decoding sub-documents, but the BSON corpus tests don&apos;t have a case for this. I&apos;m proposing that we add one to &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/bson-corpus/tests/document.json&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;document.json&lt;/a&gt; like this:&lt;/p&gt;

&lt;p/&gt;
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&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;{&lt;/span&gt;&lt;/pre&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;&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;  &quot;description&quot;: &quot;Subdocument too short, but terminator looks like EOO.&quot;,&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;  &quot;bson&quot;: &quot;&quot;140000000361000b0000001062000a0000000000&quot;&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;   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;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;For reference, the above BSON is the following document, with the length of subdocument &lt;tt&gt;a&lt;/tt&gt; decreased by one:&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;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-top: 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;{&apos;a&apos;: {&apos;b&apos;: 10}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="311369">DRIVERS-2154</key>
            <summary>BSON corpus: another test case for subdocuments that are too short</summary>
                <type id="14901" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14700&amp;avatarType=issuetype">Spec Change</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="luke.lovett">Luke Lovett</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Aug 2016 23:12:03 +0000</created>
                <updated>Thu, 31 Mar 2022 13:58:30 +0000</updated>
                                                                <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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