hacktricks/pentesting-web/integer-overflow.md

# Integer Overflow

<details>

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{% tabs %}
{% tab title="Rust" %}
```rust
fn main() {

    let mut quantity = 2147483647;
    
    let (mul_result, _) = i32::overflowing_mul(32767, quantity);
    let (add_result, _) = i32::overflowing_add(1, quantity);
    
    println!("{}", mul_result);
    println!("{}", add_result);
}
```
{% endtab %}

{% tab title="Python" %}
### Python

```python
import struct

def pack_signed_int(i):
    return struct.pack("<i", i)

def pack_unsigned_int(i):
    return struct.pack("<I", i)

def unpack_signed_int(b):
    return struct.unpack("<i", b)[0]

def unpack_unsigned_int(b):
    return struct.unpack("<I", b)[0]
```

#### Example

```python
>>> pack_signed_int(-2147483648)
b'\x00\x00\x00\x80'
>>> unpack_signed_int(b'\x00\x00\x00\x80')
-2147483648
>>> pack_unsigned_int(4294967295)
b'\xff\xff\xff\xff'
>>> unpack_unsigned_int(b'\xff\xff\xff\xff')
4294967295
```

#### References

* [Python struct documentation](https://docs.python.org/3/library/struct.html)

````
```c
#include <stdio.h>
#include <limits.h>

int main() {
    int a = INT_MAX;
    int b = 0;
    int c = 0;
    
    b = a * 100;
    c = a + 1;
    
    printf("%d\n", INT_MAX);
    printf("%d\n", b);
    printf("%d\n", c);
    return 0;
}
````
{% endtab %}
{% endtabs %}

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