I try to use mmap to access a /dev/video device via

        memorymap = (unsigned char*)mmap(0, mbuf.size, PROT_READ, MAP_SHARED,
device, 0);

The de{*filter*} tells me now, that the address I got is out of bounds.
memorymap is not equal to MAP_FAILED (in fact it is 0x40def000).

The memorymap pointer is a member of a cpp-Class representing the
video-device and the above instruction is in a method of this class.

The size and device parameters are valid.

the source of the method is:

int CCamera::initMemoryMap()
{
    if(ioctl(device, VIDIOCGMBUF, &mbuf) == -1)
    {
        DBGOUT("error at VIDIOCGMBUF");
    }

    memorymap = (unsigned char*)mmap(0, mbuf.size, PROT_READ,
MAP_SHARED, device, 0);

    if(memorymap == MAP_FAILED)
    {
        DBGOUT("mmap error");
    }
    else
    {
      DBGOUT("mmap size: %d\n", mbuf.size);
    }
    return 0;