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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>[CDRIVER-3539] Callers of _mongoc_cluster_create_server_stream must check if the return is NULL</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-3539</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;The call to &lt;tt&gt;_mongoc_cluster_create_server_stream&lt;/tt&gt; takes a &lt;tt&gt;mongoc_stream_t&lt;/tt&gt; to a server and an integer ID to the server. On success, it returns a &lt;tt&gt;mongoc_server_stream_t&lt;/tt&gt; which contains the passed &lt;tt&gt;mongoc_stream_t&lt;/tt&gt; and a copy of a &lt;tt&gt;mongoc_server_description_t&lt;/tt&gt;. On failure, it returns NULL. Many callers appear to assume it does not return NULL.&lt;/p&gt;

&lt;p&gt;It may fail if it no server description is found for the server, which may happen during monitoring if the server description is removed &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-discovery-and-monitoring.rst#topologytype-table&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;by the rules of updating the topology description SDAM&lt;/a&gt;. This would likely cause a crash.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1145382">CDRIVER-3539</key>
            <summary>Callers of _mongoc_cluster_create_server_stream must check if the return is NULL</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="13201">Fixed</resolution>
                                        <assignee username="andrew.witten@mongodb.com">Andrew Witten</assignee>
                                    <reporter username="kevin.albertson@mongodb.com">Kevin Albertson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Feb 2020 22:52:39 +0000</created>
                <updated>Sat, 28 Oct 2023 11:28:55 +0000</updated>
                            <resolved>Fri, 26 Jun 2020 18:53:36 +0000</resolved>
                                                    <fixVersion>1.17.0-rc0</fixVersion>
                    <fixVersion>1.17.0</fixVersion>
                                    <component>libmongoc</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5107056" author="kevin.albertson" created="Wed, 11 Jan 2023 20:03:16 +0000"  >&lt;p&gt;The fix in &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/fa186b7ec970be9e335ff5788c16457a5fa423a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/fa186b7ec970be9e335ff5788c16457a5fa423a2&lt;/a&gt; is faulty. The &lt;tt&gt;bson_destroy(reply)&lt;/tt&gt; calls result in a double free.&lt;/p&gt;

&lt;p&gt;This bug has gone away in 1.19.0, since &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3653&quot; title=&quot;Connections should use server descriptions from handshake, not monitoring&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3653&quot;&gt;&lt;del&gt;CDRIVER-3653&lt;/del&gt;&lt;/a&gt; changes &lt;tt&gt;_mongoc_cluster_create_server_stream&lt;/tt&gt; to no longer return &lt;tt&gt;NULL&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="3281141" author="xgen-internal-githook" created="Sat, 11 Jul 2020 16:20:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Witten&apos;, &apos;email&apos;: &apos;andrew.witten@mongodb.com&apos;, &apos;username&apos;: &apos;awitten1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3539&quot; title=&quot;Callers of _mongoc_cluster_create_server_stream must check if the return is NULL&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3539&quot;&gt;&lt;del&gt;CDRIVER-3539&lt;/del&gt;&lt;/a&gt; adds null checks&lt;/p&gt;

&lt;p&gt;Adds null checks after calls to _mongoc_cluster_create_server_stream.&lt;br/&gt;
Branch: r1.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/4ad963db1faaeccf05d4b514e72105eb72553646&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/4ad963db1faaeccf05d4b514e72105eb72553646&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3226246" author="xgen-internal-githook" created="Fri, 26 Jun 2020 18:42:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Witten&apos;, &apos;email&apos;: &apos;andrew.witten@mongodb.com&apos;, &apos;username&apos;: &apos;awitten1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3539&quot; title=&quot;Callers of _mongoc_cluster_create_server_stream must check if the return is NULL&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3539&quot;&gt;&lt;del&gt;CDRIVER-3539&lt;/del&gt;&lt;/a&gt; adds null checks&lt;/p&gt;

&lt;p&gt;Adds null checks after calls to _mongoc_cluster_create_server_stream.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/fa186b7ec970be9e335ff5788c16457a5fa423a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/fa186b7ec970be9e335ff5788c16457a5fa423a2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3224851" author="JIRAUSER1253381" created="Thu, 25 Jun 2020 21:40:39 +0000"  >&lt;p&gt;PR:&#160;&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/pull/646&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/pull/646&lt;/a&gt;&lt;/p&gt;</comment>
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