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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>[CDRIVER-2575] misaligned address in mongoc-client.c</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-2575</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;UBSAN is reporting the following problem, even when I compile without BSON_EXTRA_ALIGN:&lt;/p&gt;

&lt;p/&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;gridfs&amp;gt; fs &amp;lt;- gridfs(url = &quot;mongodb+srv://readwrite:test@cluster0-84vdt.mongodb.net/test&quot;)&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;mongoc/mongoc-client.c:279:11: runtime error: load of misaligned address 0x7ffd21a4a479 for type &apos;short int&apos;, which requires 2 byte alignment&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;
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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; 00 00 00  00 69 89 1a 63 6c 75 73  74 65 72 30 2d 73 68 61  72 64 2d 30 30 2d 30 31  2d 38 34 76 64&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;   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;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="517967">CDRIVER-2575</key>
            <summary>misaligned address in mongoc-client.c</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="-1">Unassigned</assignee>
                                    <reporter username="Jeroenooms">Jeroen Ooms [X]</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Mar 2018 13:38:16 +0000</created>
                <updated>Sat, 28 Oct 2023 11:30:00 +0000</updated>
                            <resolved>Wed, 25 Apr 2018 20:38:25 +0000</resolved>
                                    <version>1.9.3</version>
                                    <fixVersion>1.10.0</fixVersion>
                                    <component>libmongoc</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1874314" author="xgen-internal-githook" created="Wed, 25 Apr 2018 20:37:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;, &apos;name&apos;: &apos;Kevin Albertson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-2575&quot; title=&quot;misaligned address in mongoc-client.c&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-2575&quot;&gt;&lt;del&gt;CDRIVER-2575&lt;/del&gt;&lt;/a&gt; memcpy buffer before casting&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/68359aeb5ecde3441e376a61b2d47af5eabbdd53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/68359aeb5ecde3441e376a61b2d47af5eabbdd53&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1856714" author="jesse" created="Thu, 5 Apr 2018 18:36:26 +0000"  >&lt;p&gt;Need to memcpy from &quot;data&quot; to a local uint16_t before calling ntohs.&lt;/p&gt;</comment>
                            <comment id="1849673" author="jeroenooms" created="Thu, 29 Mar 2018 20:26:21 +0000"  >&lt;p&gt;This case was using gcc 7.3.0 from debian unstable with:&lt;/p&gt;
&lt;p/&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;gcc -std=gnu99 -fsanitize=undefined -fno-omit-frame-pointer&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;I get a lot of alignment errors if I compile with&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;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;-DBSON_EXTRA_ALIGN&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;but that is expected. However it should not give any alignment errors when compiling without this macro.&lt;/p&gt;

&lt;p&gt;Also these sanitizers check at runtime so perhaps my examples are not hitting all libmongoc code. &lt;/p&gt;</comment>
                            <comment id="1849526" author="jesse" created="Thu, 29 Mar 2018 19:12:47 +0000"  >&lt;p&gt;Thanks Jeroen, which compiler version and flags please? We&apos;re a little confused because -fsanitize=address gives us many &lt;b&gt;more&lt;/b&gt; warnings than this one.&lt;/p&gt;</comment>
                            <comment id="1847777" author="jeroenooms" created="Wed, 28 Mar 2018 14:45:13 +0000"  >&lt;p&gt;I&apos;m using 1.9.3 on Linux. So this is about &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/blob/1.9.3/src/mongoc/mongoc-client.c#L279&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt; in the C driver:&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;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;port = ntohs (*(&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;short&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; *) (data + 4));&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1847776" author="kevin.albertson" created="Wed, 28 Mar 2018 14:43:53 +0000"  >&lt;p&gt;Hi Jeroen, what version of the C driver are you using and what platform are you building it on?&lt;/p&gt;</comment>
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