Description The program can potentially dereference a null pointer, thereby raising a NullPointerException. Private information is important to consider whether the person is a user of the product, or part of a data set that is processed by the product. Learn more . Sign in Could you share the minimal test case? You can perform an explicit check for NULL for all pointers returned by functions that can return NULL, and when parameters are passed to the function. You also had the guts to say "never check for null" (if null is invalid).Placing an assert() in every member function that dereferences a pointer is a compromise that will likely placate a lot of people, but even that feels like 'speculative paranoia' to me. This agrees with Fortify's 81 // alleged lack of tracking method calls and assignments in its 82 // high-risk Null Dereference rule. Explanation. For example, In the ClassWriter class, a call is made to the set method of an Item object. Find and fix defects in your Java, C/C++, C#, JavaScript, Ruby, or Python open source project for free . Note: Before moving to this, to fix the issue in Example 1 we can print, And if you remember, in other words if you know that the pointer is NULL, you won't have a need to call fill_foo anyway. The repro was confirmed by the support representative and the case forwarded to the engineering team. Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isnt assigned any valid memory address yet. Request PDF | Tracking Null Checks in Open-Source Java Systems | It is widely acknowledged that null values should be avoided if possible or carefully used when necessary in Java code. But I do see a problem in line 9: Thanks, you are correct, I meant line 9 and I see the error now. OpenFromXML.java, line 545 (Password Management: Empty Password) . Should you wish to do so, please emailFortifyTechSupport@hpe.com and reference support case#00278285 opened on Oct 10. The method ThroughDate intentionally uses the C# 6.0 null-conditional operator to guard against null values, and is designed to safely return null if any of the values it processes happen to be null. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Sorry I do not know how to make sense of the Rule ID you mentioned. Believe me, using "dereference" to mean "set to null" is a misconception. The program can dereference a null-pointer because it does not check the return value of a function that might return null. Demos (FindBugs, Fortify SCA) Integrating static analysis Wrap up. The Java VM sets them so, as long as Java isn't corrupted, you're safe. Is a PhD visitor considered as a visiting scholar? Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated.
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