Hanno Böck created XERCESC-2051:
-----------------------------------
Summary: Overlapping memcpy call
Key: XERCESC-2051
URL: https://issues.apache.org/jira/browse/XERCESC-2051
Project: Xerces-C++
Issue Type: Bug
Affects Versions: 3.1.2
Reporter: Hanno Böck
Priority: Minor
Attachments: xerces-c-overlapping-memcpy.diff
When running the test suite with address sanitizer enabled it will report an
overlapping memcpy call:
< =================================================================
< ==8236==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges
[0x0000006678c0,0x0000006678ca) and [0x0000006678c2, 0x0000006678cc) overlap
< #0 0x7f1025853f24
(/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2/libasan.so.1+0x2ff24)
< #1 0x7f1024df4bf8 in xercesc_3_1::XMLString::moveChars(unsigned short*,
unsigned short const*, unsigned long) xercesc/util/XMLString.hpp:1446
< #2 0x7f1024e627eb in xercesc_3_1::XMLString::collapseWS(unsigned short*,
xercesc_3_1::MemoryManager*) xercesc/util/XMLString.cpp:1813
< #3 0x44a098 in DOMTest::testUtilFunctions() src/DOM/DOMTest/DTest.cpp:5752
< #4 0x412865 in main src/DOM/DOMTest/DTest.cpp:984
< #5 0x7f10209b5f9f in __libc_start_main (/lib64/libc.so.6+0x1ff9f)
< #6 0x405848 (/tmp/xerces-c-3.1.2/tests/.libs/DOMTest+0x405848)
<
< 0x0000006678c0 is located 0 bytes inside of global variable 'tempStr' from
'src/DOM/DOMTest/DTest.cpp' (0x6678c0) of size 8000
< 0x0000006678c2 is located 2 bytes inside of global variable 'tempStr' from
'src/DOM/DOMTest/DTest.cpp' (0x6678c0) of size 8000
< SUMMARY: AddressSanitizer: memcpy-param-overlap ??:0 ??
< ==8236==ABORTING
memcpy calls to overlapping memory areas are not allowed. memmove can be used
in such instances. (I'll attach a patch that changes that, but I'd ask for it
to be reviewed by someone familiar with the code and check whether the
overlapping copying is really intended.)
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