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C++ detectors (35/35)

Disabled HTML autoescape Weak pseudorandom number generation Missing Default in Switch Unsafe File Extension Incorrect Order Of setuid and setgid Out Of Bounds Read Out Of Bounds Write Thread safety violation Incorrect Pointer Subtraction File System Access Insecure Buffer Access Incorrect Use of Sizeof Incorrect Pointer Scaling Loose File Permissions Sensitive information leak Missing Authorization Return Stack Address OS Command Injection Use After Free Incorrect Comparison off by one error Path traversal Insecure temporary file or directory Insecure Cryptography Insecure connection using unencrypted protocol Unchecked Null Dereference SQL injection Missing check on method output Improper Restriction on Memory Buffer Multiple Locks Improper Input Validation Null Pointer Dereference Use Of Redundant Code Improper Certificate Validation Improper Authentication

Null Pointer Dereference Medium

Dereferencing a null pointer can lead to unexpected null pointer exceptions. Consider adding a null check before dereferencing the pointer.

Detector ID

cpp/null-pointer-dereference@v1.0

Category

Common Weakness Enumeration (CWE)

Tags

Noncompliant example

1#include <cstdlib>
2
3void nullPointerDereferenceNoncompliant()
4{
5    int *ptr;
6    // Noncompliant: Dereferencing uninitialized pointer.
7    int value = *ptr;
8}

Compliant example

1#include <cstdlib>
2
3int nullPointerDereferenceCompliant()
4{
5    int *ptr = NULL;
6    // Compliant: Checking ptr value before dereferencing.
7    if (ptr != NULL)
8    {
9        int value = *ptr;
10    }
11    
12}