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Linux Error EFAULT (errno 14) — Bad Address Fix

Warninglinux errno

About Linux Error EFAULT (errno 14)

Linux errno 14 EFAULT means a system call received an invalid memory address (bad pointer). This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Error: EFAULT (errno 14). Message: Bad address. System call received an invalid pointer. Programming error — null or freed pointer. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Passing NULL pointer to system call. Using freed memory (use-after-free). Buffer overflow corrupted a pointer. Stack corruption from recursion overflow. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Check for NULL pointers before system calls. Use Valgrind to detect memory errors. Enable AddressSanitizer: gcc -fsanitize=address. Review code for use-after-free bugs. Check stack size with ulimit -s. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Linux Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.

Quick Answer

Is EFAULT always a bug?

Yes — it indicates a programming error in memory handling.

Overview

Linux errno 14 EFAULT means a system call received an invalid memory address (bad pointer).

Key Details

  • Error: EFAULT (errno 14)
  • Message: Bad address
  • System call received an invalid pointer
  • Programming error — null or freed pointer

Common Causes

  • Passing NULL pointer to system call
  • Using freed memory (use-after-free)
  • Buffer overflow corrupted a pointer
  • Stack corruption from recursion overflow

Steps

  1. 1Check for NULL pointers before system calls
  2. 2Use Valgrind to detect memory errors
  3. 3Enable AddressSanitizer: gcc -fsanitize=address
  4. 4Review code for use-after-free bugs
  5. 5Check stack size with ulimit -s

Tags

linuxlinux-errnolinux errno 14ubuntuterminal

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Frequently Asked Questions

Yes — it indicates a programming error in memory handling.