[BCEL-308] NullPointerException in Verifier Pass 3A

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.2
• Fix Version/s: 6.8.0
• Component/s: Verifier
• Assignee: Unassigned
• Reporter: Rohan Padhye
• Created: 23/Aug/18 05:38
• Updated: 17/Jun/23 21:17
• Resolved: 17/Jun/23 21:17

Description

Verifier throws NPE on malformed input instead of reporting verification failure.

Steps to reproduce:

 

Save the attached file as "Hello.class" and run:

java -cp <classpath> org.apache.bcel.verifier.Verifier Hello

 

The file Hello.class was generated automatically by the fuzzer JQF (https://github.com/rohanpadhye/jqf).

Expected output:

VERIFIED_REJECTED

Observed output:

JustIce by Enver Haase, (C) 2001-2002.

<http://bcel.sourceforge.net>

<http://commons.apache.org/bcel>

 

Now verifying: Hello

 

Pass 1:

VERIFIED_OK

Passed verification.

 

Pass 2:

VERIFIED_OK

Passed verification.

 

Exception in thread "main" java.lang.NullPointerException

at org.apache.bcel.generic.FieldOrMethod.getReferenceType(FieldOrMethod.java:116)

at org.apache.bcel.generic.FieldOrMethod.getLoadClassType(FieldOrMethod.java:133)

at org.apache.bcel.verifier.statics.Pass3aVerifier$InstOperandConstraintVisitor.visitLoadClass(Pass3aVerifier.java:521)

at org.apache.bcel.generic.INVOKESPECIAL.accept(INVOKESPECIAL.java:86)

at org.apache.bcel.generic.InstructionHandle.accept(InstructionHandle.java:302)

at org.apache.bcel.verifier.statics.Pass3aVerifier.pass3StaticInstructionOperandsChecks(Pass3aVerifier.java:443)

at org.apache.bcel.verifier.statics.Pass3aVerifier.do_verify(Pass3aVerifier.java:208)

at org.apache.bcel.verifier.PassVerifier.verify(PassVerifier.java:71)

at org.apache.bcel.verifier.Verifier.doPass3a(Verifier.java:89)

at org.apache.bcel.verifier.Verifier.main(Verifier.java:216)