Handling of XPath function arguments in error case

The XPath engine tries to guarantee that every XPath function can pop
'nargs' non-NULL values off the stack. libxslt, for example, relies on
this assumption. But the check isn't thorough enough if there are errors
during the evaluation of arguments. This can lead to segfaults:

https://mail.gnome.org/archives/xslt/2013-December/msg00005.html

This commit makes the handling of function arguments more robust.

* Bail out early when evaluation of XPath function arguments fails.
* Make sure that there are 'nargs' arguments in the current call frame.
1 file changed
tree: 701e3fb5e03022c2b366a8233be05bc68b252318
  1. bakefile/
  2. doc/
  3. example/
  4. include/
  5. macos/
  6. optim/
  7. python/
  8. result/
  9. test/
  10. vms/
  11. VxWorks/
  12. win32/
  13. xstc/
  14. .gitignore
  15. acinclude.m4
  16. AUTHORS
  17. autogen.sh
  18. buf.c
  19. buf.h
  20. build_glob.py
  21. c14n.c
  22. catalog.c
  23. ChangeLog
  24. check-relaxng-test-suite.py
  25. check-relaxng-test-suite2.py
  26. check-xinclude-test-suite.py
  27. check-xml-test-suite.py
  28. check-xsddata-test-suite.py
  29. chvalid.c
  30. chvalid.def
  31. configure.in
  32. Copyright
  33. dbgen.pl
  34. dbgenattr.pl
  35. debugXML.c
  36. dict.c
  37. DOCBparser.c
  38. elfgcchack.h
  39. enc.h
  40. encoding.c
  41. entities.c
  42. error.c
  43. genChRanges.py
  44. gentest.py
  45. genUnicode.py
  46. global.data
  47. globals.c
  48. HACKING
  49. hash.c
  50. HTMLparser.c
  51. HTMLtree.c
  52. INSTALL.libxml2
  53. legacy.c
  54. libxml-2.0-uninstalled.pc.in
  55. libxml-2.0.pc.in
  56. libxml.3
  57. libxml.h
  58. libxml.m4
  59. libxml.spec.in
  60. libxml2.doap
  61. libxml2.syms
  62. list.c
  63. MAINTAINERS
  64. Makefile.am
  65. Makefile.tests
  66. Makefile.win
  67. nanoftp.c
  68. nanohttp.c
  69. NEWS
  70. parser.c
  71. parserInternals.c
  72. pattern.c
  73. README
  74. README.cvs-commits
  75. README.tests
  76. regressions.py
  77. regressions.xml
  78. relaxng.c
  79. rngparser.c
  80. runsuite.c
  81. runtest.c
  82. runxmlconf.c
  83. save.h
  84. SAX.c
  85. SAX2.c
  86. schematron.c
  87. testapi.c
  88. testAutomata.c
  89. testC14N.c
  90. testchar.c
  91. testdict.c
  92. testdso.c
  93. testHTML.c
  94. testlimits.c
  95. testModule.c
  96. testOOM.c
  97. testOOMlib.c
  98. testOOMlib.h
  99. testReader.c
  100. testrecurse.c
  101. testRegexp.c
  102. testRelax.c
  103. testSAX.c
  104. testSchemas.c
  105. testThreads.c
  106. testThreadsWin32.c
  107. testURI.c
  108. testXPath.c
  109. threads.c
  110. timsort.h
  111. TODO
  112. TODO_SCHEMAS
  113. tree.c
  114. trio.c
  115. trio.h
  116. triodef.h
  117. trionan.c
  118. trionan.h
  119. triop.h
  120. triostr.c
  121. triostr.h
  122. uri.c
  123. valid.c
  124. xinclude.c
  125. xlink.c
  126. xml2-config.1
  127. xml2-config.in
  128. xml2Conf.sh.in
  129. xmlcatalog.c
  130. xmlIO.c
  131. xmllint.c
  132. xmlmemory.c
  133. xmlmodule.c
  134. xmlreader.c
  135. xmlregexp.c
  136. xmlsave.c
  137. xmlschemas.c
  138. xmlschemastypes.c
  139. xmlstring.c
  140. xmlunicode.c
  141. xmlwriter.c
  142. xpath.c
  143. xpointer.c
  144. xzlib.c
  145. xzlib.h