Error: invalid-allocation-alignment

Address Sanitizer Error: invalid-allocation-alignment

The _aligned_malloc function requires a power of 2 for expressing the alignment. We simulate the "external" calculation of some alignment factor using an unoptimized global variable.

Example

// example1.cpp
// invalid-allocation-alignment error
#include <Windows.h>

int ExternalAlign = 5;

int main(){

    // this externally calculated alignment of 5 isn't valid.

    void* ptr = _aligned_malloc(8,ExternalAlign); 
    return (ptr == nullptr && errno == EINVAL) ? 0 : -1;
}

To build and test this example, run these commands in a Visual Studio 2019 version 16.9 or later developer command prompt:

cl example1.cpp /fsanitize=address /Zi
devenv /debugexe example1.exe

Resulting error

See also

AddressSanitizer overview
AddressSanitizer known issues
AddressSanitizer build and language reference
AddressSanitizer runtime reference
AddressSanitizer shadow bytes
AddressSanitizer cloud or distributed testing
AddressSanitizer debugger integration
AddressSanitizer error examples