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https://issues.apache.org/jira/browse/XERCESJ-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Guangtai Liang reopened XERCESJ-1553:
-------------------------------------
Please refer to the test case provided for reproducing the NPE issue
(https://issues.apache.org/jira/browse/XERCESJ-1553) which showed that
this.fDefault can be null, you need to null-check it before dereference it.
The detailed description info is copied here:
"
In case of error "a-props-correct.2" (Invalid value constraint value '%1' in
attribute '%2'.), attribute fDefault or fDefault.actualValue might be null and
the code might result in a NPE.
How to reproduce: Example from xml schema test suite:
msxsdtest\attribute\attP006.xsd
In my case, when anlysing invalid schema files (as good as possible), it is
important not to have this exception, so I'm working with my own patched
version of Xerces2-J. It would be nice if you would fix this somewhen.
My fix is quite simple: just check on null:
Old:
return getConstraintType() == XSConstants.VC_NONE ?
null :
fDefault.actualValue.toString();
New:
return getConstraintType() == XSConstants.VC_NONE ? null :
(fDefault == null ? null :
(fDefault.actualValue == null ? null :
(fDefault.actualValue.toString())));
"
> An incomplete fix for the NPE bugs in XSAttributeUseImpl.java
> -------------------------------------------------------------
>
> Key: XERCESJ-1553
> URL: https://issues.apache.org/jira/browse/XERCESJ-1553
> Project: Xerces2-J
> Issue Type: Bug
> Components: Other
> Reporter: Guangtai Liang
> Priority: Critical
> Labels: incomplete_fix, missing_fixes
>
> The fix revision 320528 was aimed to remove an NPE bug on the "this.fDefault"
> and "this.fDefault.actualValue" in the method "getConstraintValue" of the
> file
> "/xerces/java/trunk/src/org/apache/xerces/impl/xs/XSAttributeUseImpl.java" ,
> but it is incomplete.
> Since the "this.fDefault" is a class field and also could be null during the
> run-time execution, it should also be null-checked before being dereferenced
> in other methods.
> The buggy code locations the same fix needs to be applied at are as bellows:
> Line 123 of the method "getActualVC";
> public Object getActualVC() {
> return getConstraintType() == XSConstants.VC_NONE ?
> null :
> fDefault.actualValue;
> }
> Line 129 of the method "getActualVCType":
> public short getActualVCType() {
> return getConstraintType() == XSConstants.VC_NONE ?
> XSConstants.UNAVAILABLE_DT :
> fDefault.actualValueType;
> }
> Line 135 of the method "getItemValueTypes" :
> public ShortList getItemValueTypes() {
> return getConstraintType() == XSConstants.VC_NONE ?
> null :
> fDefault.itemValueTypes;
> }
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