To get a trial key
fill out the form below
Team License (standard version)
Enterprise License (extended version)
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
GBP
RUB
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

>
>
>
V598. The 'memset/memcpy' function is u…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V598. The 'memset/memcpy' function is used to nullify/copy the fields of 'Foo' class. Virtual table pointer will be damaged by this.

Dec. 28, 2011

The analyzer has detected that such low-level functions as memset() or memcpy() are used to handle a class. It is inadmissible when a class has pointer to a virtual method table. The memset()/memcpy() functions might rewrite virtual table pointer (VPTR), and the program behavior will become undefined.

Consider the following code sample.

class MyClass
{
  int A, B, C;
  char buf[100];
  MyClass();
  virtual ~MyClass() {}
};

MyClass::MyClass()
{
  memset(this, 0, sizeof(*this));
}

Note that there is a virtual destructor in the class. It means that the class has a virtual table pointer. The programmer was too lazy to clear the class members separately and used the memset() function for that purpose. It will spoil the VPTR, since the memset() function does not know anything about it.

This is the correct code:

MyClass:: MyClass() : A(0), B(0), C(0)
{
  memset(buf, 0, sizeof(buf));
}

This diagnostic is classified as:

  • CWE-665
  • CERT-EXP62-CPP
  • CERT-OOP57-CPP

You can look at examples of errors detected by the V598 diagnostic.

This website uses cookies and other technology to provide you a more personalized experience. By continuing the view of our web-pages you accept the terms of using these files. If you don't want your personal data to be processed, please, leave this site.
Learn More →
Accept