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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CSHARP-1155] GridFS: &quot;metadata&quot; can be set to a value which causes an exception when the file is subsequently queried (or handled at all)</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1155</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p/&gt;
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					&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;	f.Write( bytes, 0, bytes.Length );&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&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;db.GridFS.SetMetadata( db.GridFS.FindOne( &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;test.txt&quot;&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;metadata metadata metadata&quot;&lt;/span&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;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var&lt;/span&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; info = db.GridFS.FindOne( &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;test.txt&quot;&lt;/span&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;p/&gt;
&lt;p&gt;The above code when run the first time will give an exception at the last line. As:&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;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&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;System.InvalidCastException: Unable to cast object of type &apos;MongoDB.Bson.BsonString&apos; to type &apos;MongoDB.Bson.BsonDocument&apos;.&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;The exception is generated internally by the C# driver when it assumes the &apos;metadata&apos; field as a &lt;tt&gt;BsonDocument&lt;/tt&gt; despite allowing us to set it to something else only a couple of lines above.&lt;/p&gt;

&lt;p&gt;In other words, the C# driver can create a GridFS entry that it can&apos;t load.&lt;/p&gt;

&lt;p&gt;All GridFS functions on this file entry are wedged. You cannot edit it, you cannot replace, update, or even delete it.&lt;/p&gt;

&lt;p&gt;The fatal trigger is &lt;tt&gt;SetMetadata&lt;/tt&gt;, although using another driver to do the same operation is a viable alternative. Ultimately, inside the C# driver the presence of the &quot;metadata&quot; field causes an unstoppable type cast to occur when doing any operation with the tainted file entry - even just trying to delete it is fatal!&lt;/p&gt;

&lt;p&gt;For example, the following call now gives the same exception:&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;   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;db.GridFS.Delete( &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;test.txt&quot;&lt;/span&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;p/&gt;
&lt;p&gt;Knowing the file ID does not help, the following also causes the same exception:&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;   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;db.GridFS.DeleteById( &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&lt;/span&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; ObjectId( &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;5498dfa9f8efe9309c99e9d3&quot;&lt;/span&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;p/&gt;

&lt;p&gt;The offending line of code for v1.9.2 is here:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/blob/v1.9.2/MongoDB.Driver/GridFS/MongoGridFSFileInfo.cs#L759&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/blob/v1.9.2/MongoDB.Driver/GridFS/MongoGridFSFileInfo.cs#L759&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="175888">CSHARP-1155</key>
            <summary>GridFS: &quot;metadata&quot; can be set to a value which causes an exception when the file is subsequently queried (or handled at all)</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                            <label>cs</label>
                    </labels>
                <created>Tue, 23 Dec 2014 03:33:51 +0000</created>
                <updated>Thu, 2 Mar 2017 16:41:42 +0000</updated>
                            <resolved>Thu, 2 Mar 2017 16:41:42 +0000</resolved>
                                                                    <component>GridFS</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1514497" author="rstam" created="Thu, 2 Mar 2017 16:41:42 +0000"  >&lt;p&gt;Since this only applies to the Legacy API and the Legacy API is no longer under active development this issue will not be fixed.&lt;/p&gt;

&lt;p&gt;The 2.x GridFS API does not have this issue.&lt;/p&gt;</comment>
                            <comment id="1464188" author="rstam" created="Thu, 22 Dec 2016 17:55:02 +0000"  >&lt;p&gt;The GridFS spec requires that the metadata be a BsonDocument.&lt;/p&gt;

&lt;p&gt;SetMetadata should &lt;b&gt;not&lt;/b&gt; have allowed the metadata to be set to anything other than a BsonDocument.&lt;/p&gt;

&lt;p&gt;In a future release we will add a SetMetadataDocument method that takes a BsonDocument parameter and deprecate the current SetMetadata method.&lt;/p&gt;

&lt;p&gt;Note also that this is the Legacy API. The new 2.x GridFS API does not have this issue.&lt;/p&gt;</comment>
                    </comments>
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