Use-after-free when processing namespace nodes inside a function
Stylesheet
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:func="http://exslt.org/functions" version="1.0" extension-element-prefixes="func">
<func:function name="func:f">
<xsl:param name="n"/>
<xsl:apply-imports/>
<xsl:for-each select="namespace::*">
<xsl:sort/>
</xsl:for-each>
</func:function>
<xsl:template match="//child::node()[last()]">
<xsl:value-of select="func:f('5')|abc"/>
</xsl:template>
</xsl:stylesheet>
Source document
<top xmlns:type_confusion="aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffh" />
ASan logs
=================================================================
==3250==ERROR: AddressSanitizer: heap-use-after-free on address 0x604000002c98 at pc 0x7fe9c726e451 bp 0x7ffd059a9d80 sp 0x7ffd059a9d78
READ of size 4 at 0x604000002c98 thread T0
#0 0x7fe9c726e450 in xmlXPathNodeSetCreate__internal_alias /work/libxml2/xpath.c:3547:11
#1 0x7fe9c7270315 in xmlXPathNewNodeSet__internal_alias /work/libxml2/xpath.c:4349:23
#2 0x7fe9c7279eca in xmlXPathCacheNewNodeSet /work/libxml2/xpath.c:2434:12
#3 0x7fe9c728f9b1 in xmlXPathCompOpEval /work/libxml2/xpath.c:13343:22
#4 0x7fe9c728f085 in xmlXPathCompOpEval /work/libxml2/xpath.c:13350:26
#5 0x7fe9c728e9e4 in xmlXPathCompOpEval /work/libxml2/xpath.c:13310:22
#6 0x7fe9c728ed17 in xmlXPathCompOpEval /work/libxml2/xpath.c:13801:26
#7 0x7fe9c72822fd in xmlXPathRunEval /work/libxml2/xpath.c:14372:2
#8 0x7fe9c7281a49 in xmlXPathCompiledEvalInternal /work/libxml2/xpath.c:14740:11
#9 0x7fe9c7281992 in xmlXPathCompiledEval__internal_alias /work/libxml2/xpath.c:14786:5
#10 0x7fe9c7962b65 in xsltPreCompEval /work/libxslt/libxslt/transform.c:381:11
#11 0x7fe9c7963741 in xsltValueOf /work/libxslt/libxslt/transform.c:4549:11
#12 0x7fe9c795ae31 in xsltApplySequenceConstructor /work/libxslt/libxslt/transform.c:2779:17
#13 0x7fe9c7959f3b in xsltApplyXSLTTemplate /work/libxslt/libxslt/transform.c:3229:5
#14 0x7fe9c7958123 in xsltProcessOneNode /work/libxslt/libxslt/transform.c:2202:2
#15 0x7fe9c7958962 in xsltDefaultProcessOneNode /work/libxslt/libxslt/transform.c:2032:3
#16 0x7fe9c7958330 in xsltProcessOneNode /work/libxslt/libxslt/transform.c:2164:2
#17 0x7fe9c7968aaf in xsltApplyStylesheetInternal /work/libxslt/libxslt/transform.c:6049:5
#18 0x7fe9c7969c78 in xsltApplyStylesheetUser /work/libxslt/libxslt/transform.c:6288:11
#19 0x515c96 in xsltProcess /work/libxslt/xsltproc/xsltproc.c
#20 0x514a46 in main /work/libxslt/xsltproc/xsltproc.c:925:6
#21 0x7fe9c6123b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
#22 0x41b109 in _start (/usr/local/bin/xsltproc+0x41b109)
0x604000002c98 is located 8 bytes inside of 48-byte region [0x604000002c90,0x604000002cc0)
freed by thread T0 here:
#0 0x4dadf0 in __interceptor_free.localalias.0 (/usr/local/bin/xsltproc+0x4dadf0)
#1 0x7fe9c726e1c3 in xmlXPathNodeSetFreeNs__internal_alias /work/libxml2/xpath.c:3514:2
#2 0x7fe9c727019f in xmlXPathFreeNodeSet__internal_alias /work/libxml2/xpath.c:4185:3
#3 0x7fe9c72690c3 in xmlXPathFreeObject__internal_alias /work/libxml2/xpath.c:5506:3
#4 0x7fe9c796787c in xsltForEach /work/libxslt/libxslt/transform.c:5630:2
#5 0x7fe9c795ae31 in xsltApplySequenceConstructor /work/libxslt/libxslt/transform.c:2779:17
#6 0x7fe9c795a85b in xsltApplyOneTemplate /work/libxslt/libxslt/transform.c:3351:2
#7 0x7fe9c76c70f3 in exsltFuncFunctionFunction /work/libxslt/libexslt/functions.c:440:5
#8 0x7fe9c72911af in xmlXPathCompOpEval /work/libxml2/xpath.c:13457:17
#9 0x7fe9c728e979 in xmlXPathCompOpEval /work/libxml2/xpath.c:13308:22
#10 0x7fe9c728ed17 in xmlXPathCompOpEval /work/libxml2/xpath.c:13801:26
#11 0x7fe9c72822fd in xmlXPathRunEval /work/libxml2/xpath.c:14372:2
#12 0x7fe9c7281a49 in xmlXPathCompiledEvalInternal /work/libxml2/xpath.c:14740:11
#13 0x7fe9c7281992 in xmlXPathCompiledEval__internal_alias /work/libxml2/xpath.c:14786:5
#14 0x7fe9c7962b65 in xsltPreCompEval /work/libxslt/libxslt/transform.c:381:11
#15 0x7fe9c7963741 in xsltValueOf /work/libxslt/libxslt/transform.c:4549:11
#16 0x7fe9c795ae31 in xsltApplySequenceConstructor /work/libxslt/libxslt/transform.c:2779:17
#17 0x7fe9c7959f3b in xsltApplyXSLTTemplate /work/libxslt/libxslt/transform.c:3229:5
#18 0x7fe9c7958123 in xsltProcessOneNode /work/libxslt/libxslt/transform.c:2202:2
#19 0x7fe9c7958962 in xsltDefaultProcessOneNode /work/libxslt/libxslt/transform.c:2032:3
#20 0x7fe9c7958330 in xsltProcessOneNode /work/libxslt/libxslt/transform.c:2164:2
#21 0x7fe9c7968aaf in xsltApplyStylesheetInternal /work/libxslt/libxslt/transform.c:6049:5
#22 0x7fe9c7969c78 in xsltApplyStylesheetUser /work/libxslt/libxslt/transform.c:6288:11
#23 0x515c96 in xsltProcess /work/libxslt/xsltproc/xsltproc.c
#24 0x514a46 in main /work/libxslt/xsltproc/xsltproc.c:925:6
#25 0x7fe9c6123b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
previously allocated by thread T0 here:
#0 0x4dafc0 in malloc (/usr/local/bin/xsltproc+0x4dafc0)
#1 0x7fe9c726e557 in xmlXPathNodeSetDupNs /work/libxml2/xpath.c:3481:22
#2 0x7fe9c726ecfc in xmlXPathNodeSetAddNs__internal_alias /work/libxml2/xpath.c:3687:35
#3 0x7fe9c729388e in xmlXPathNodeCollectAndTest /work/libxml2/xpath.c:12425:8
#4 0x7fe9c728f0c3 in xmlXPathCompOpEval /work/libxml2/xpath.c:13353:26
#5 0x7fe9c728ed17 in xmlXPathCompOpEval /work/libxml2/xpath.c:13801:26
#6 0x7fe9c72822fd in xmlXPathRunEval /work/libxml2/xpath.c:14372:2
#7 0x7fe9c7281a49 in xmlXPathCompiledEvalInternal /work/libxml2/xpath.c:14740:11
#8 0x7fe9c7281992 in xmlXPathCompiledEval__internal_alias /work/libxml2/xpath.c:14786:5
#9 0x7fe9c7962b65 in xsltPreCompEval /work/libxslt/libxslt/transform.c:381:11
#10 0x7fe9c79670c2 in xsltForEach /work/libxslt/libxslt/transform.c:5534:11
#11 0x7fe9c795ae31 in xsltApplySequenceConstructor /work/libxslt/libxslt/transform.c:2779:17
#12 0x7fe9c795a85b in xsltApplyOneTemplate /work/libxslt/libxslt/transform.c:3351:2
#13 0x7fe9c76c70f3 in exsltFuncFunctionFunction /work/libxslt/libexslt/functions.c:440:5
#14 0x7fe9c72911af in xmlXPathCompOpEval /work/libxml2/xpath.c:13457:17
#15 0x7fe9c728e979 in xmlXPathCompOpEval /work/libxml2/xpath.c:13308:22
#16 0x7fe9c728ed17 in xmlXPathCompOpEval /work/libxml2/xpath.c:13801:26
#17 0x7fe9c72822fd in xmlXPathRunEval /work/libxml2/xpath.c:14372:2
#18 0x7fe9c7281a49 in xmlXPathCompiledEvalInternal /work/libxml2/xpath.c:14740:11
#19 0x7fe9c7281992 in xmlXPathCompiledEval__internal_alias /work/libxml2/xpath.c:14786:5
#20 0x7fe9c7962b65 in xsltPreCompEval /work/libxslt/libxslt/transform.c:381:11
#21 0x7fe9c7963741 in xsltValueOf /work/libxslt/libxslt/transform.c:4549:11
#22 0x7fe9c795ae31 in xsltApplySequenceConstructor /work/libxslt/libxslt/transform.c:2779:17
#23 0x7fe9c7959f3b in xsltApplyXSLTTemplate /work/libxslt/libxslt/transform.c:3229:5
#24 0x7fe9c7958123 in xsltProcessOneNode /work/libxslt/libxslt/transform.c:2202:2
#25 0x7fe9c7958962 in xsltDefaultProcessOneNode /work/libxslt/libxslt/transform.c:2032:3
#26 0x7fe9c7958330 in xsltProcessOneNode /work/libxslt/libxslt/transform.c:2164:2
#27 0x7fe9c7968aaf in xsltApplyStylesheetInternal /work/libxslt/libxslt/transform.c:6049:5
#28 0x7fe9c7969c78 in xsltApplyStylesheetUser /work/libxslt/libxslt/transform.c:6288:11
#29 0x515c96 in xsltProcess /work/libxslt/xsltproc/xsltproc.c
SUMMARY: AddressSanitizer: heap-use-after-free /work/libxml2/xpath.c:3547:11 in xmlXPathNodeSetCreate__internal_alias
Shadow bytes around the buggy address:
0x0c087fff8540: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 05 fa
0x0c087fff8550: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 05 fa
0x0c087fff8560: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 05 fa
0x0c087fff8570: fa fa 00 00 00 00 00 00 fa fa fd fd fd fd fd fd
0x0c087fff8580: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fa
=>0x0c087fff8590: fa fa fd[fd]fd fd fd fd fa fa fd fd fd fd fd fd
0x0c087fff85a0: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fa
0x0c087fff85b0: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fd
0x0c087fff85c0: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fd
0x0c087fff85d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c087fff85e0: 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
==3250==ABORTING