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    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36926] Undefined behavior from signed overflow in cursor manager, can result in mongos invariant failure</title>
                <link>https://jira.mongodb.org/browse/SERVER-36926</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; pointed this out while we were reading some code at my desk:&lt;/p&gt;

&lt;p&gt;The call to &lt;tt&gt;std::abs(_pseudoRandom.nextInt32())&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5699eaafce230c4d6975bbe8a670a91f0487ebd4/src/mongo/s/query/cluster_cursor_manager.cpp#L242-L245&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; could result in undefined behavior if &lt;tt&gt;_pseudoRandom.nextInt32()&lt;/tt&gt; returns MIN_INT. Most compilers will probably do something reasonable in this situation. Many will probably just return MIN_INT, meaning that it&apos;s possible to get a negative cursor id.&lt;/p&gt;</description>
                <environment></environment>
        <key id="597366">SERVER-36926</key>
            <summary>Undefined behavior from signed overflow in cursor manager, can result in mongos invariant failure</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="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>asdf</label>
                            <label>bkp</label>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 29 Aug 2018 19:17:36 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:33 +0000</updated>
                            <resolved>Mon, 10 Sep 2018 17:49:31 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                    <fixVersion>4.0.24</fixVersion>
                    <fixVersion>3.6.24</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="3702970" author="xgen-internal-githook" created="Tue, 6 Apr 2021 14:11:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;, &apos;username&apos;: &apos;TedTuckman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36926&quot; title=&quot;Undefined behavior from signed overflow in cursor manager, can result in mongos invariant failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36926&quot;&gt;&lt;del&gt;SERVER-36926&lt;/del&gt;&lt;/a&gt; Remove possibility of passing INT_MIN to abs() in ClusterCursorManager&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0e5b2946e1750fd4a5ac30cdc6d67d6fda94d378)&lt;br/&gt;
(cherry picked from commit 368553479c74478d15204383289d1291ad097909)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fc3f626537400cf3b6dd89daf9ee8f50c45e03cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fc3f626537400cf3b6dd89daf9ee8f50c45e03cb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3701979" author="xgen-internal-githook" created="Mon, 5 Apr 2021 22:13:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;, &apos;username&apos;: &apos;TedTuckman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36926&quot; title=&quot;Undefined behavior from signed overflow in cursor manager, can result in mongos invariant failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36926&quot;&gt;&lt;del&gt;SERVER-36926&lt;/del&gt;&lt;/a&gt; Remove possibility of passing INT_MIN to abs() in ClusterCursorManager&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0e5b2946e1750fd4a5ac30cdc6d67d6fda94d378)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/368553479c74478d15204383289d1291ad097909&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/368553479c74478d15204383289d1291ad097909&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3701766" author="david.storch" created="Mon, 5 Apr 2021 20:43:02 +0000"  >&lt;p&gt;I have identified that this issue is the root cause of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27796&quot; title=&quot;Invariant failure in cluster_cursor_manager.cpp, numDeleted == 1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27796&quot;&gt;&lt;del&gt;SERVER-27796&lt;/del&gt;&lt;/a&gt;, which means that it should be backported to all supported branches. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27796?focusedCommentId=3701762&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-3701762&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;my comment here&lt;/a&gt; for additional details.&lt;/p&gt;</comment>
                            <comment id="1998291" author="xgen-internal-githook" created="Mon, 10 Sep 2018 17:43:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;, &apos;username&apos;: &apos;TedTuckman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36926&quot; title=&quot;Undefined behavior from signed overflow in cursor manager, can result in mongos invariant failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36926&quot;&gt;&lt;del&gt;SERVER-36926&lt;/del&gt;&lt;/a&gt; Remove possibility of passing INT_MIN to abs() in ClusterCursorManager&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e5b2946e1750fd4a5ac30cdc6d67d6fda94d378&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e5b2946e1750fd4a5ac30cdc6d67d6fda94d378&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1996388" author="david.storch" created="Fri, 7 Sep 2018 15:23:41 +0000"  >&lt;p&gt;We can fix this by generating a new random number when we get MIN_INT, before calling &lt;tt&gt;std::abs()&lt;/tt&gt;.&lt;/p&gt;</comment>
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