[xml] Release of libxml2 2.9.11

[Daniel Veillard <veillard redhat com>]

  Pffff, I am way way behind, but now that CVE-2021-3541 is out I just pushed
that long awaited release. libxml2 2.9.11 is tagged in git and a signed
tarball is available at the usual place:

    ftp://xmlsoft.org/libxml2/


  This release incoporate the various security and quadatic patches that
Nick has found and fixed, and CVE-2021-3541. There is also a very large list
of bug fixes and improvement most of them from Nick too:

Security:
- Patch for security issue CVE-2021-3541 (Daniel Veillard)
Documentation:
- Clarify xmlNewDocProp documentation (Nick Wellnhofer)
Portability:
- CMake: Only add postfixes if MSVC (Christopher Degawa)
- Fix XPath NaN/Inf for older GCC versions (Nick Wellnhofer)
- Use CMake PROJECT_VERSION (Markus Rickert)
- Fix warnings in libxml.m4 with autoconf 2.70+. (Simon Josefsson)
- Add CI for CMake on MSVC (Markus Rickert)
- Update minimum required CMake version (Markus Rickert)
- Add variables for configured options to CMake config files (Markus Rickert)
- Check if variables exist when defining targets (Markus Rickert)
- Check if target exists when reading target properties (Markus Rickert)
- Add xmlcatalog target and definition to config files (Markus Rickert)
- Remove include directories for link-only dependencies (Markus Rickert)
- Fix ICU build in CMake (Markus Rickert)
- Configure pkgconfig, xml2-config, and xml2Conf.sh file (Markus Rickert)
- Update CMake config files (Markus Rickert)
- Add xmlcatalog and xmllint to CMake export (Markus Rickert)
- Simplify xmlexports.h (Nick Wellnhofer)
- Require dependencies based on enabled CMake options (Markus Rickert)
- Use NAMELINK_COMPONENT in CMake install (Markus Rickert)
- Add CMake files to EXTRA_DIST (Markus Rickert)
- Add missing compile definition for static builds to CMake (Markus Rickert)
- Add CI for CMake on Linux and MinGW (Markus Rickert)
- Fix variable name in win32/configure.js (Nick Wellnhofer)
- Fix version parsing in win32/configure.js (Nick Wellnhofer)
- Fix autotools warnings (Nick Wellnhofer)
- Update config.h.cmake.in (Markus Rickert)
- win32: allow passing *FLAGS on command line (Michael Stahl)
- Configure file xmlwin32version.h.in on MSVC (Markus Rickert)
- List headers individually (Markus Rickert)
- Add CMake build files (Markus Rickert)
- Parenthesize Py<type>_Check() in ifs (Miro Hrončok)
- Minor fixes to configure.js (Nick Wellnhofer)
Bug Fixes:
- Fix null deref in legacy SAX1 parser (Nick Wellnhofer)
- Fix handling of unexpected EOF in xmlParseContent (Nick Wellnhofer)
- Fix line numbers in error messages for mismatched tags (Nick Wellnhofer)
- Fix htmlTagLookup (Nick Wellnhofer)
- Propagate error in xmlParseElementChildrenContentDeclPriv (Nick Wellnhofer)
- Fix user-after-free with `xmllint --xinclude --dropdtd` (Nick Wellnhofer)
- Fix dangling pointer with `xmllint --dropdtd` (Nick Wellnhofer)
- Validate UTF8 in xmlEncodeEntities (Joel Hockey)
- Fix use-after-free with `xmllint --html --push` (Nick Wellnhofer)
- Allow FP division by zero in xmlXPathInit (Nick Wellnhofer)
- Fix xmlGetNodePath with invalid node types (Nick Wellnhofer)
- Fix exponential behavior with recursive entities (Nick Wellnhofer)
- Fix quadratic behavior when looking up xml:* attributes (Nick Wellnhofer)
- Fix slow parsing of HTML with encoding errors (Nick Wellnhofer)
- Fix null deref introduced with previous commit (Nick Wellnhofer)
- Check for invalid redeclarations of predefined entities (Nick Wellnhofer)
- Add the copy of type from original xmlDoc in xmlCopyDoc() (SVGAnimate)
- parser.c: shrink the input buffer when appropriate (Mike Dalessio)
- Fix infinite loop in HTML parser introduced with recent commits (Nick Wellnhofer)
- Fix quadratic runtime when parsing CDATA sections (Nick Wellnhofer)
- Fix timeout when handling recursive entities (Nick Wellnhofer)
- Fix memory leak in xmlParseElementMixedContentDecl (Nick Wellnhofer)
- Fix null deref in xmlStringGetNodeList (Nick Wellnhofer)
- use new htmlParseLookupCommentEnd to find comment ends (Mike Dalessio)
- htmlParseComment: treat `--!>` as if it closed the comment (Mike Dalessio)
- Fix integer overflow in xmlSchemaGetParticleTotalRangeMin (Nick Wellnhofer)
- encoding: fix memleak in xmlRegisterCharEncodingHandler() (Xiaoming Ni)
- xmlschemastypes.c: xmlSchemaGetFacetValueAsULong add, check "facet->val" (Xiaoming Ni)
- Fix null pointer deref in xmlXPtrRangeInsideFunction (Nick Wellnhofer)
- Fix quadratic runtime in HTML push parser with null bytes (Nick Wellnhofer)
- Avoid quadratic checking of identity-constraints (Michael Matz)
- Fix building with ICU 68. (Frederik Seiffert)
- Convert python/libxml.c to PY_SSIZE_T_CLEAN (Victor Stinner)
- Fix xmlURIEscape memory leaks. (Elliott Hughes)
- Avoid call stack overflow with XML reader and recursive XIncludes (Nick Wellnhofer)
- Fix caret in regexp character group (Nick Wellnhofer)
- parser.c: xmlParseCharData peek behavior fixed wrt newlines (Mike Dalessio)
- Fix memory leaks in XPointer string-range function (Nick Wellnhofer)
- Fix use-after-free when XIncluding text from Reader (Nick Wellnhofer)
- Fix SEGV in xmlSAXParseFileWithData (yanjinjq)
- Fix null deref in XPointer expression error path (Nick Wellnhofer)
- Don't call xmlXPathInit directly (Nick Wellnhofer)
- Fix cleanup of attributes in XML reader (Nick Wellnhofer)
- Fix double free in XML reader with XIncludes (Nick Wellnhofer)
- Fix memory leak in xmlXIncludeAddNode error paths (Nick Wellnhofer)
- Revert "Fix quadratic runtime in xi:fallback processing" (Nick Wellnhofer)
- Fix error reporting with xi:fallback (Nick Wellnhofer)
- Fix quadratic runtime in xi:fallback processing (Nick Wellnhofer)
- Fix corner case with empty xi:fallback (Nick Wellnhofer)
- Fix XInclude regression introduced with recent commit (Nick Wellnhofer)
- Fix memory leak in runtest.c (Nick Wellnhofer)
- Make "xmllint --push --recovery" work (Nick Wellnhofer)
- Revert "Do not URI escape in server side includes" (Nick Wellnhofer)
- Fix column number accounting in xmlParse*NameAndCompare (Nick Wellnhofer)
- Stop counting nbChars in parser context (Nick Wellnhofer)
- Fix out-of-bounds read with 'xmllint --htmlout' (Nick Wellnhofer)
- Fix exponential runtime and memory in xi:fallback processing (Nick Wellnhofer)
- Don't process siblings of root in xmlXIncludeProcess (Nick Wellnhofer)
- Don't recurse into xi:include children in xmlXIncludeDoProcess (Nick Wellnhofer)
- Fix memory leak in xmlXIncludeIncludeNode error paths (Nick Wellnhofer)
- Check for custom free function in global destructor (Nick Wellnhofer)
- Fix integer overflow when comparing schema dates (Nick Wellnhofer)
- Fix exponential runtime in xmlFARecurseDeterminism (Nick Wellnhofer)
- Don't try to handle namespaces when building HTML documents (Nick Wellnhofer)
- Fix several quadratic runtime issues in HTML push parser (Nick Wellnhofer)
- Fix quadratic runtime when push parsing HTML start tags (Nick Wellnhofer)
- Reset XML parser input before reporting errors (David Kilzer)
- Fix quadratic runtime when push parsing HTML entity refs (Nick Wellnhofer)
- Fix HTML push parser lookahead (Nick Wellnhofer)
- Make htmlCurrentChar always translate U+0000 (Nick Wellnhofer)
- Fix UTF-8 decoder in HTML parser (Nick Wellnhofer)
- Fix quadratic runtime when parsing HTML script content (Nick Wellnhofer)
- Reset HTML parser input before reporting error (Nick Wellnhofer)
- Fix more quadratic runtime issues in HTML push parser (Nick Wellnhofer)
- Fix regression introduced with 477c7f6a (Nick Wellnhofer)
- Fix quadratic runtime in HTML parser (Nick Wellnhofer)
- Reset HTML parser input before reporting encoding error (Nick Wellnhofer)
- Fix integer overflow in xmlFAParseQuantExact (Nick Wellnhofer)
- Fix return value of xmlC14NDocDumpMemory (Nick Wellnhofer)
- Don't follow next pointer on documents in xmlXPathRunStreamEval (Nick Wellnhofer)
- Fix integer overflow in _xmlSchemaParseGYear (Nick Wellnhofer)
- Fix integer overflow when parsing {min,max}Occurs (Nick Wellnhofer)
- Fix another memory leak in xmlSchemaValAtomicType (Nick Wellnhofer)
- Fix unsigned integer overflow in htmlParseTryOrFinish (Nick Wellnhofer)
- Fix integer overflow in htmlParseCharRef (Nick Wellnhofer)
- Fix undefined behavior in UTF16LEToUTF8 (Nick Wellnhofer)
- Fix return value of xmlCharEncOutput (Nick Wellnhofer)
- Never expand parameter entities in text declaration (Nick Wellnhofer)
- Fix undefined behavior in xmlXPathTryStreamCompile (Nick Wellnhofer)
- Fix use-after-free with validating reader (Nick Wellnhofer)
- xmlParseBalancedChunkMemory must not be called with NULL doc (Nick Wellnhofer)
- Revert "Fix memory leak in xmlParseBalancedChunkMemoryRecover" (Nick Wellnhofer)
- Fix memory leak in xmlXIncludeLoadDoc error path (Nick Wellnhofer)
- Make schema validation fail with multiple top-level elements (Nick Wellnhofer)
- Call xmlCleanupParser on ELF destruction (Samuel Thibault)
- Fix copying of entities in xmlParseReference (Nick Wellnhofer)
- Fix memory leak in xmlSchemaValidateStream (Zhipeng Xie)
- Fix xmlSchemaGetCanonValue formatting for date and dateTime (Kevin Puetz)
- Fix memory leak when shared libxml.dll is unloaded (Kevin Puetz)
- Fix potentially-uninitialized critical section in Win32 DLL builds (Kevin Puetz)
- Fix integer overflow in xmlBufferResize (Nick Wellnhofer)
- Check for overflow when allocating two-dimensional arrays (Nick Wellnhofer)
- Remove useless comparisons (Nick Wellnhofer)
- Fix overflow check in xmlNodeDump (Nick Wellnhofer)
- Fix infinite loop in xmlStringLenDecodeEntities (Zhipeng Xie)
- Fix freeing of nested documents (Nick Wellnhofer)
- Fix more memory leaks in error paths of XPath parser (Nick Wellnhofer)
- Fix memory leaks of encoding handlers in xmlsave.c (Nick Wellnhofer)
- Fix xml2-config error code (Nick Wellnhofer)
- Fix memory leak in error path of XPath expr parser (Nick Wellnhofer)
- Fix overflow handling in xmlBufBackToBuffer (Nick Wellnhofer)
- Null pointer handling in catalog.c (raniervf)
- xml2-config.in: fix regressions introduced by commit 2f2bf4b2c (Dmitry V. Levin)
Improvements:
- Store per-element parser state in a struct (Nick Wellnhofer)
- update for xsd:language type check (PaulHiggs)
- Update INSTALL.libxml2 (Nick Wellnhofer)
- Fix include order in c14n.h (Nick Wellnhofer)
- Fix duplicate xmlStrEqual calls in htmlParseEndTag (Nick Wellnhofer)
- Speed up htmlCheckAutoClose (Nick Wellnhofer)
- Speed up htmlTagLookup (Nick Wellnhofer)
- Stop checking attributes for UTF-8 validity (Nick Wellnhofer)
- Reduce some fuzzer timeouts (Nick Wellnhofer)
- Only run a few CI tests unless scheduled (Nick Wellnhofer)
- Improve fuzzer stability (Nick Wellnhofer)
- Check for feature flags in fuzzer tests (Nick Wellnhofer)
- Another attempt at improving fuzzer stability (Nick Wellnhofer)
- Revert "Improve HTML fuzzer stability" (Nick Wellnhofer)
- Add charset names to fuzzing dictionaries (Nick Wellnhofer)
- Improve HTML fuzzer stability (Nick Wellnhofer)
- Add CI for MSVC x86 (Markus Rickert)
- Add a flag to not output anything when xmllint succeeded (hhb)
- Speed up HTML fuzzer (Nick Wellnhofer)
- Remove unused encoding parameter of HTML output functions (Nick Wellnhofer)
- Handle malloc failures in fuzzing code (Nick Wellnhofer)
- add test coverage for incorrectly-closed comments (Mike Dalessio)
- Enforce maximum length of fuzz input (Nick Wellnhofer)
- Remove temporary members from struct _xmlXPathContext (Nick Wellnhofer)
- Build the Python extension with PY_SSIZE_T_CLEAN (Victor Stinner)
- Add CI test for Python 3 (Nick Wellnhofer)
- Add fuzzing dictionaries to EXTRA_DIST (Nick Wellnhofer)
- Add 'fuzz' subdirectory to DIST_SUBDIRS (Nick Wellnhofer)
- Allow port numbers up to INT_MAX (Nick Wellnhofer)
- Handle dumps of corrupted documents more gracefully (Nick Wellnhofer)
- Limit size of free lists in XML reader when fuzzing (Nick Wellnhofer)
- Hardcode maximum XPath recursion depth (Nick Wellnhofer)
- Pass URL of main entity in XML fuzzer (Nick Wellnhofer)
- Consolidate seed corpus generation (Nick Wellnhofer)
- Test fuzz targets with dummy driver (Nick Wellnhofer)
- Fix regression introduced with commit d88df4b (Nick Wellnhofer)
- Fix regression introduced with commit 74dcc10b (Nick Wellnhofer)
- Add TODO comment in xinclude.c (Nick Wellnhofer)
- Stop using maxParserDepth in xpath.c (Nick Wellnhofer)
- Remove dead code in xinclude.c (Nick Wellnhofer)
- Don't add formatting newlines to XInclude nodes (Nick Wellnhofer)
- Don't use SAX1 if all element handlers are NULL (Nick Wellnhofer)
- Remove unneeded progress checks in HTML parser (Nick Wellnhofer)
- Use strcmp when fuzzing (Nick Wellnhofer)
- Fix XPath fuzzer (Nick Wellnhofer)
- Fuzz XInclude engine (Nick Wellnhofer)
- Add XPath and XPointer fuzzer (Nick Wellnhofer)
- Update fuzzing code (Nick Wellnhofer)
- More *NodeDumpOutput fixes (Nick Wellnhofer)
- Fix *NodeDumpOutput functions (Nick Wellnhofer)
- Make xmlNodeDumpOutputInternal non-recursive (Nick Wellnhofer)
- Make xhtmlNodeDumpOutput non-recursive (Nick Wellnhofer)
- Make htmlNodeDumpFormatOutput non-recursive (Nick Wellnhofer)
- Fix .gitattributes (Nick Wellnhofer)
- Rework control flow in htmlCurrentChar (Nick Wellnhofer)
- Make 'xmllint --html --push -' read from stdin (Nick Wellnhofer)
- Remove misleading comments in xpath.c (Nick Wellnhofer)
- Update to Devhelp index file format version 2 (Andre Klapper)
- Set project language to C (Markus Rickert)
- Add variable for working directory of XML Conformance Test Suite (Markus Rickert)
- Add additional tests and XML Conformance Test Suite (Markus Rickert)
- Add command line option for temp directory in runtest (Markus Rickert)
- Ensure LF line endings for test files (Markus Rickert)
- Enable runtests and testThreads (Markus Rickert)
- Limit regexp nesting depth (Nick Wellnhofer)
- Fix return values and documentation in encoding.c (Nick Wellnhofer)
- Add regexp regression tests (David Kilzer)
- Report error for invalid regexp quantifiers (Nick Wellnhofer)
- Fix rebuilding docs, by hiding __attribute__((...)) behind a macro. (Martin Vidner)
- Copy xs:duration parser from libexslt (Nick Wellnhofer)
- Fuzz target for XML Schemas (Nick Wellnhofer)
- Move entity recorder to fuzz.c (Nick Wellnhofer)
- Fuzz target for HTML parser (Nick Wellnhofer)
- Update GitLab CI container (Nick Wellnhofer)
- Add options file for xml fuzzer (Nick Wellnhofer)
- Add a couple of libFuzzer targets (Nick Wellnhofer)
- Guard new calls to xmlValidatePopElement in xml_reader.c (Daniel Cheng)
- Add LIBXML_VALID_ENABLED to xmlreader (Łukasz Wojniłowicz)
- Fix typos (Nick Wellnhofer)
- Disable LeakSanitizer (Nick Wellnhofer)
- Stop calling SAX getEntity handler from XMLReader (Nick Wellnhofer)
- Add test case for recursive external parsed entities (Nick Wellnhofer)
- Enable error tests with entity substitution (Nick Wellnhofer)
- Don't load external entity from xmlSAX2GetEntity (Nick Wellnhofer)
- Merge code paths loading external entities (Nick Wellnhofer)
- Copy some XMLReader option flags to parser context (Nick Wellnhofer)
- Add xmlPopOutputCallbacks (Nick Wellnhofer)
- Updated Python test reader2.py (Pieter van Oostrum)
- Updated python/tests/tstLastError.py (Pieter van Oostrum)
- Use random seed in xmlDictComputeFastKey (Ranier Vilela)
- Enable more undefined behavior sanitizers (Nick Wellnhofer)

  Thanks everybody who contributed for this release, obviously Nick did
the bulk of the work but there were a number of other contributors,

   enjoy !

Daniel

-- 
Daniel Veillard      | Red Hat Developers Tools http://developer.redhat.com/
veillard redhat com  | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
http://veillard.com/ | virtualization library  http://libvirt.org/