Program: 12765
Project: 12765
Buggy source:
public byte[] applyPatch(String name,byte[] basicClass,boolean obfuscated){
  String iPAMethodName="String_Node_Str";
  if (obfuscated) {
    iPAMethodName=METHOD_IPA_NOTCH;
  }
 else {
    iPAMethodName=METHOD_IPA;
  }
  ClassNode classNode=new ClassNode();
  ClassReader classReader=new ClassReader(basicClass);
  classReader.accept(classNode,0);
  Iterator<MethodNode> methods=classNode.methods.iterator();
  while (methods.hasNext()) {
    MethodNode m=methods.next();
    if (m.name.equals(iPAMethodName) && m.desc.equals("String_Node_Str" + CLASS_POTION_SRG + "String_Node_Str")) {
      Logger.i(TAG,"String_Node_Str");
      InsnList toIn=new InsnList();
      toIn.add(new VarInsnNode(Opcodes.ALOAD,0));
      toIn.add(new VarInsnNode(Opcodes.ALOAD,1));
      toIn.add(new MethodInsnNode(Opcodes.INVOKESTATIC,"String_Node_Str","String_Node_Str","String_Node_Str" + CLASS_POTION_SRG + "String_Node_Str",false));
      LabelNode l1=new LabelNode();
      toIn.add(new JumpInsnNode(Opcodes.IFEQ,l1));
      LabelNode l2=new LabelNode();
      toIn.add(l2);
      toIn.add(new InsnNode(Opcodes.ICONST_1));
      toIn.add(new InsnNode(Opcodes.IRETURN));
      toIn.add(l1);
      toIn.add(new FrameNode(Opcodes.F_SAME,0,null,0,null));
      m.instructions.insert(toIn);
      Logger.i(TAG,"String_Node_Str");
      break;
    }
  }
  ClassWriter writer=new ClassWriter(ClassWriter.COMPUTE_MAXS);
  classNode.accept(writer);
  return writer.toByteArray();
}

Fixed version (ground truth):
public byte[] applyPatch(String name,byte[] basicClass,boolean obfuscated){
  String iPAMethodName="String_Node_Str";
  if (obfuscated) {
    iPAMethodName=METHOD_IPA_MCP;
  }
 else {
    iPAMethodName=METHOD_IPA;
  }
  String gAPMethodName="String_Node_Str";
  if (obfuscated) {
    gAPMethodName=METHOD_GAP_MCP;
  }
 else {
    gAPMethodName=METHOD_GAP;
  }
  ClassNode classNode=new ClassNode();
  ClassReader classReader=new ClassReader(basicClass);
  classReader.accept(classNode,0);
  Iterator<MethodNode> methods=classNode.methods.iterator();
  while (methods.hasNext()) {
    MethodNode m=methods.next();
    if (m.name.equals(iPAMethodName) && m.desc.equals("String_Node_Str" + CLASS_POTION_SRG + "String_Node_Str")) {
      Logger.i(TAG,"String_Node_Str");
      InsnList toIn=new InsnList();
      toIn.add(new VarInsnNode(Opcodes.ALOAD,0));
      toIn.add(new VarInsnNode(Opcodes.ALOAD,1));
      toIn.add(new MethodInsnNode(Opcodes.INVOKESTATIC,"String_Node_Str","String_Node_Str","String_Node_Str" + CLASS_POTION_SRG + "String_Node_Str",false));
      LabelNode l1=new LabelNode();
      toIn.add(new JumpInsnNode(Opcodes.IFEQ,l1));
      LabelNode l2=new LabelNode();
      toIn.add(l2);
      toIn.add(new InsnNode(Opcodes.ICONST_1));
      toIn.add(new InsnNode(Opcodes.IRETURN));
      toIn.add(l1);
      toIn.add(new FrameNode(Opcodes.F_SAME,0,null,0,null));
      m.instructions.insert(toIn);
      Logger.i(TAG,"String_Node_Str");
    }
 else     if (m.name.equals(gAPMethodName)) {
      Logger.i(TAG,"String_Node_Str");
      InsnList toIn=new InsnList();
      LabelNode l0=new LabelNode();
      toIn.add(l0);
      toIn.add(new VarInsnNode(Opcodes.ALOAD,0));
      toIn.add(new VarInsnNode(Opcodes.ALOAD,1));
      toIn.add(new MethodInsnNode(Opcodes.INVOKESTATIC,"String_Node_Str","String_Node_Str","String_Node_Str" + CLASS_POTION_SRG + "String_Node_Str",false));
      LabelNode l1=new LabelNode();
      toIn.add(new JumpInsnNode(Opcodes.IFEQ,l1));
      LabelNode l2=new LabelNode();
      toIn.add(l2);
      toIn.add(new MethodInsnNode(Opcodes.INVOKESTATIC,"String_Node_Str","String_Node_Str","String_Node_Str" + CLASS_POTIONEFFECT_SRG + "String_Node_Str",false));
      toIn.add(new InsnNode(Opcodes.ARETURN));
      toIn.add(l1);
      m.instructions.insert(toIn);
      Logger.i(TAG,"String_Node_Str");
    }
  }
  ClassWriter writer=new ClassWriter(ClassWriter.COMPUTE_MAXS);
  classNode.accept(writer);
  return writer.toByteArray();
}