Core · Module 4 · Lesson 5 of 9

Dynamic Memory Lifecycles and Leak Prevention

Track heap ownership semantics, eliminate memory leaks, use AddressSanitizer and Valgrind, and prevent dangling pointer bugs.

ProAbout 16 minutes

By the end you can

Identify the four categories of dynamic memory lifecycle errors in C
Apply single-owner and borrowed-pointer patterns to manage heap lifetimes
Diagnose leaks and heap memory corruptions using AddressSanitizer and Valgrind
Neutralize dangling pointer vulnerabilities using pointer nullification idioms

Builds on Heap Allocation with malloc, calloc, and realloc.

01 · A question first

Why can a C server run with stable memory for days, only to crash suddenly from an OOM killer because a single error path forgot to call free()? And why does reading a pointer after calling free() sometimes return the old data, misleading developers until memory is corrupted hours later?

Make a guess before you read on.

02 · The idea

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What's inside

Start with the problem
How the idea works
Why it is correct
What it costs
Pitfalls and variations
Where it is used