CONCURRENCY.LOCK.NOUNLOCK : Missing Lock Release

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CodeSonar^® 9.2p0

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CodeSecure Inc

C and C++

CONCURRENCY.LOCK.NOUNLOCK : Missing Lock Release

Summary

A lock was acquired in the body of a function, but not released before the function returned.

Properties

Class Name

Missing Lock Release

Significance

style

Mnemonic

CONCURRENCY.LOCK.NOUNLOCK

Categories

MisraC2025	MisraC2025:22.16	All mutex objects locked by a thread shall be explicitly unlocked by the same thread
MisraC2023	MisraC2023:22.16	All mutex objects locked by a thread shall be explicitly unlocked by the same thread
Misra2012	Misra2012:22.16	All mutex objects locked by a thread shall be explicitly unlocked by the same thread
CWE	CWE:667	Improper Locking
CERT-C	CERT-C:CON01-C	Acquire and release synchronization primitives in the same module, at the same level of abstraction
CERT-CPP	CERT-CPP:CON51-CPP	Ensure actively held locks are released on exceptional conditions
JPL	JPL:9	Place restrictions on the use of semaphores and locks.

Availability

Available for C and C++.

Enabling

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

WARNING_FILTER += allow class="Missing Lock Release"

Triggering Functions

Missing Lock Release warnings can be triggered by the following functions.

Any function treated as a lock acquisition function by CodeSonar:
- any library function that is recognized as a lock acquisition function 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 a lock acquisition function.
Any function specified with the LOCK_FUNCTIONS configuration file parameter.

Example

#include <pthread.h>

pthread_mutex_t LockA;

void nounlock(void){
    pthread_mutex_lock(&LockA);
    return;    /* 'Missing Lock Release' warning issued here */
}

Relevant Configuration File Parameters

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

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