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Objective-C

Objective-C : Incorrect dispatch_once usage

Classification

OWASP Mobile Top 10 2016
M7-Poor Code Quality

Overview

The dispatch_once function is misused. This may lead to incorrect application behavior in a multithreaded environment.

The dispatch_once function is used to ensure that the section of code is executed only once, regardless of the distribution of tasks over threads. This function must accept a static variable (used as a mutex) as an argument (predicate). Otherwise, the execution uniqueness can not be guaranteed.

References

  1. The Right Way To Write A Singleton - krakendev.io
  2. dispatch_once upon a time - bignerdranch.com
  3. Singletons in Objective-C - galloway.me.uk
  4. Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC? - stackoverflow.com
  5. Mobile Top 10 2016-M7-Poor Code Quality
MEDIUM

DerScanner Severity Score

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See also

Objective-C

Objective-C : Internal information leak

Objective-C

Objective-C : Weak hashing algorithm

Objective-C

Objective-C : Unsafe reflection