Questions tagged [double-free]
94 questions
0
votes
1 answer
Correctly exit forked process in C++
Reading the answer to How to end C++ code, I learned that calling exit from C++ code is bad. But what if I have forked a child process which must end somewhere and is so deep down the call stack that passing down its exit code to main would be…
user1978011
- 3,419
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- 38
0
votes
2 answers
Double free() occurrence where it should not
I have a frustrating problem for which I can't find an answer to.
I have this function:
// Append character to the end of a string
void str_AppendChar(char* s, const char* ch)
{
// +2 because of 2x '\0'
char* buff =…
B Mutev
- 3
- 2
0
votes
3 answers
Double free or corruption error with string assignment
I am having errors in string assignment here. This is a function we coded for storing data fetched from a url.
edit : datanode structure
struct node
{
string url;
std::string* data;
struct node* next;
struct node* prev;
};
…
sai pallavi
- 147
- 3
- 10
0
votes
1 answer
double free or corruption (fasttop) when use recursive method in C++
I implemented a Stack class and tried to make use of that class to solve Hanoi Problem. Here is my code:
template
class Node
{
public:
Node()
{
next = NULL;
prev = NULL;
}
…
Shanpei Zhou
- 371
- 1
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- 17
-1
votes
1 answer
Double free or corruption error in python
I am using pygame on replit and am getting an unsual error.
This error usually comes from a c or c++ compiler when you attempt to free the same memory twice, but this is python. I think it is a replit issue because the error doesn't happen in atom…
Jacob
- 135
- 2
- 12
-1
votes
1 answer
Double free reported in my code using openssl 1.0.2k
I am using openssl library 1.0.2k in my application. In some random situations, a double free error condition is occurring.
The basic code flow is:
BIO* sbio = NULL;
if (!(con = (SSL *) SSL_new(ctx))) {
sprintf(ReturnBuf, "sweb: Cannot create…
mona sinha
- 9
- 2
-1
votes
1 answer
c++ deleting a pointer from 2 sets of pointers
I have 2 sets of pointers where I want to delete a certain pointer from. But it's giving me a double free error at the last line in the delete edge function.
I initially suspected that maybe it was because set::erase() was implicitly calling delete…
funnypig run
- 182
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- 9
-1
votes
3 answers
What exactly happens when I do buffer1.push_back(buffer2.front()) in C++?
Help me understand this.
Here is the context.
I am writing a program in C++.
I have 2 buffers (deque). Let's call them buffer1 and buffer2;
I have 2 threads: one thread is filling buffer1 with random values. The other one is copying the oldest…
Filipe Santos
- 61
- 2
- 9
-1
votes
2 answers
*** Error in `./a.out': double free or corruption (!prev): 0x096fb008 *** Aborted (core dumped)
I am getting the error same as the title. I think it is happening because of matrix A but can't understand why and how to fix it.
Kindly help me out. Here is the complete code. I am using g++ to compile the code.
#include
#include…
Goyal
- 15
- 1
- 1
-1
votes
1 answer
Double free error deallocating a 2d array
I'm working on a program that uses a structure with 2d array as fields.
But for some reason evrytime I try to use the free_planet function I receive a double free error. Using programs as valgrind it seems the problems are the instructions from row…
IXion
- 11
- 2
-1
votes
2 answers
Double free or corruption- why?
class matrix{
private:
int n, *wsk;
friend istream & operator>>(istream&,matrix&);
friend ostream & operator<<(ostream&,matrix&);
public:
matrix(){
wsk=0;
n=0;
}
…
oszust002
- 65
- 6
-1
votes
2 answers
Double-free error in execution after deleting pointer in deconstructor
I have a class containing a member pointer which is dynamically allocated in its constructor as follows:
class Record {
public:
Record(unsigned short numBytes, char* bufRecord);
~Record();
unsigned short size() {return…
cgurleyuk
- 151
- 7
-2
votes
1 answer
Why does a double free occur?
I've been trying to write a spell checker program that takes a dictionary and a text file to find the misspelled words as fast as possible. However, I get an error message stating that a double free occurred on running the program. I'd like to know…
MelPradeep
- 35
- 5
-2
votes
1 answer
double free or corruption when trying to erase in unordered_map
I have a class Block that inherits from a class case :
class Case {
public:
Case(sf::Vector2f const& pos, sf::IntRect const& textureRect, int type = 1);
protected:
int type_;
sf::Vector2f pos_;
sf::FloatRect hitBox_;
…
Guillaume Magniadas
- 176
- 8
-2
votes
2 answers
Program in C who reads a file and transform his characters produces a double free or corruption error
When executing my program, I have this error:
*** Error in `./xorcipher': double free or corruption (!prev): 0x00000000024a1010 ***
======= Backtrace:…
LinuxCrusher
- 37
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