evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode)
{
	int fd;

#ifdef O_CLOEXEC
	fd = open(pathname, flags|O_CLOEXEC, (mode_t)mode);
	if (fd >= 0 || errno == EINVAL)
		return fd;
	/* If we got an EINVAL, fall through and try without O_CLOEXEC */
#endif
	fd = open(pathname, flags, (mode_t)mode);
	if (fd < 0)
		return -1;

#if defined(FD_CLOEXEC)
	if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
		close(fd);
		return -1;
	}
#endif

	return fd;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.