NULL Pointer Dereference
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.
NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.
Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.
While there are no complete fixes aside from conscientious programming, the following steps will go a long way to ensure that NULL pointer dereferences do not occur.
If you are working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the if statement; and unlock when it has finished.
This example takes an IP address from a user, verifies that it is well formed and then looks up the hostname and copies it into a buffer.
If an attacker provides an address that appears to be well-formed, but the address does not resolve to a hostname, then the call to gethostbyaddr() will return NULL. Since the code does not check the return value from gethostbyaddr (CWE-252), a NULL pointer dereference (CWE-476) would then occur in the call to strcpy().
Note that this code is also vulnerable to a buffer overflow (CWE-119).
In the following code, the programmer assumes that the system always has a property named "cmd" defined. If an attacker can control the program's environment so that "cmd" is not defined, the program throws a NULL pointer exception when it attempts to call the trim() method.
This Android application has registered to handle a URL when sent an intent:
The application assumes the URL will always be included in the intent. When the URL is not present, the call to getStringExtra() will return null, thus causing a null pointer exception when length() is called.
Weaknesses in this category are related to the CISQ Quality Measures for Reliability. Presence of these weaknesses could reduce the reliability of the software.
Weaknesses in this category are related to the rules and recommendations in the Expressions (EXP) section of the SEI CERT C Coding Standard.
Weaknesses in this category are related to the rules and recommendations in the Expressions (EXP) section of the SEI CERT Oracle Secure Coding Standard for Java.
This view (slice) covers all the elements in CWE.
CWE entries in this view are listed in the 2020 CWE Top 25 Most Dangerous Software Weaknesses.
CWE entries in this view are listed in the 2019 CWE Top 25 Most Dangerous Software Errors.