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Corruption of the heap: what could be the cause?
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Corruption of the heap: what could be the cause?
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I am investigating a crash due to heap corruption. As this issue is non-trivial and involves analyzing the stack and dump results, I have decided to do a code review of files related to the crash.
To be frank, I don't have in-depth knowledge of when the heap could be corrupted.
I would appreciate if you could suggest scenarios which could lead to heap corruption.
Platform: Windows XP
Language: C++
Compiler: VC6
Thanks in advance
Common scenarios include:
- Writing outside the allocated space of an array (
char *stuff = new char[10]; stuff[10] = 3;) - Casting to the wrong type
- Uninitialized pointers
- Typo error for -> and .
- Typo error when using * and & (or multiple of either)
[EDIT] From the comments, a few more:
- Mixing new [] and new with delete [] and delete
- Missing or incorrect copy-constructors
- Pointer pointing to garbage
- Calling delete multiple times on the same data
- Polymorphic baseclasses without virtual destructors
Tags
memory-management
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