ALLOC.LEAK : Leak

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ALLOC.LEAK : Leak

Dynamically allocated storage has not been freed.

Class Name

Leak

Significance

reliability

Mnemonic

ALLOC.LEAK

Categories

MisraC2023	MisraC2023:22.1	All resources obtained dynamically by means of Standard Library functions shall be explicitly released
	MisraC2023:D.4.1	Run-time failures shall be minimized
Misra2012	Misra2012:22.1	All resources obtained dynamically by means of Standard Library functions shall be explicitly released
	Misra2012:D.4.1	Run-time failures shall be minimized
AUTOSARC++14	AUTOSARC++14:A18-5-5	Memory management functions shall ensure the following: (a) deterministic behavior resulting with the existence of worst-case execution time, (b) avoiding memory fragmentation, (c) avoid running out of memory, (d) avoiding mismatched allocations or deallocations, (e) no dependence on non-deterministic calls to kernel.
CWE	CWE:401	Missing Release of Memory after Effective Lifetime
	CWE:459	Incomplete Cleanup
	CWE:771	Missing Reference to Active Allocated Resource
	CWE:772	Missing Release of Resource after Effective Lifetime
	CWE:773	Missing Reference to Active File Descriptor or Handle
	CWE:775	Missing Release of File Descriptor or Handle after Effective Lifetime
	CWE:1091	Use of Object without Invoking Destructor Method
TS17961	TS17961:5.18-fileclose	5.18. Failing to close files or free dynamic memory when they are no longer needed
CERT-C	CERT-C:CON30-C	Clean up thread-specific storage
	CERT-C:FIO42-C	Close files when they are no longer needed
	CERT-C:MEM00-C	Allocate and free memory in the same module, at the same level of abstraction
	CERT-C:MEM11-C	Do not assume infinite heap space
	CERT-C:MEM31-C	Free dynamically allocated memory when no longer needed
CERT-CPP	CERT-CPP:ERR57-CPP	Do not leak resources when handling exceptions
	CERT-CPP:FIO51-CPP	Close files when they are no longer needed
	CERT-CPP:MEM51-CPP	Properly deallocate dynamically allocated resources
	CERT-CPP:OOP54-CPP	Gracefully handle self-copy assignment
JSF++	JSF++:79	All resources acquired by a class shall be released by the class's destructor.
	JSF++:81	The assignment operator shall handle self-assignment correctly.

Availability

Available for C and C++.

Enabling

Checks for this warning class are enabled by default. To disable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += discard class="Leak"

#include <stdlib.h>

int leak(void){
    int rv=0;
    char *p = malloc(100);
    if (p){
        rv = 1;
    }
    return rv;  /* 'Leak' warning issued here */
}

A leak occurs when the last reference to a dynamically allocated object is lost.

CodeSonar checks for leaks of the values returned from any function treated as an allocator by CodeSonar:

any library function that is recognized as an allocator because CodeSonar ships with a library model that identifies it as such, and
any function for which you have added a library model identifying it as an allocator.

The following configuration file parameters affect checks for this warning class.

ALLOC.LEAK : Leak

Summary

Properties

Example

Notes

Enforced Checks

Relevant Configuration File Parameters