After doing free(ptr) what does ptr point to:- null

Question

C / C++

none

After doing free(ptr) what does ptr point to:- null

(no address now) or the previous dynamic allocated address or any random address on heap/stack?

0

02.05.2022

6 ответов

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Thomas

This description really does not apply for userspace applications

0

02.05.2022

Thomas

Assigning to it will never overwrite program code or OS code, because that memory will not be writable for normal userland applications, so program will just crash the moment that is attempted

0

02.05.2022

none Автор вопроса

Thomas
This description really does not apply for userspa...

Okayy

0

02.05.2022

none Автор вопроса

Thomas
Assigning to it will never overwrite program code ...

Ohh this clarification was necessary as it wrongly scared me how dangerous dangling pointers can be

0

02.05.2022

Manav | avoid unnecessary messaging me

none
Ohh this clarification was necessary as it wrongly...

dangling pointers are definitely dangerous

0

02.05.2022

Thomas · Accepted Answer

Thomas

So free cannot modify ptr to anything else

0

02.05.2022

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After doing free(ptr) what does ptr point to:- null

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