loadplugin(argv)
    char **argv;
{
    char *arg = *argv;
    void *handle;
    const char *err;
    void (*init) __P((void));
    char *path = arg;
    const char *vers;

    if (strchr(arg, '/') == 0) {
	const char *base = _PATH_PLUGIN;
	int l = strlen(base) + strlen(arg) + 2;
	path = malloc(l);
	if (path == 0)
	    novm("plugin file path");
	strlcpy(path, base, l);
	strlcat(path, "/", l);
	strlcat(path, arg, l);
    }
    handle = dlopen(path, RTLD_GLOBAL | RTLD_NOW);
    if (handle == 0) {
	err = dlerror();
	if (err != 0)
	    option_error("%s", err);
	option_error("Couldn't load plugin %s", arg);
	goto err;
    }
    init = (void (*)(void))dlsym(handle, "plugin_init");
    if (init == 0) {
	option_error("%s has no initialization entry point", arg);
	goto errclose;
    }
    vers = (const char *) dlsym(handle, "pppd_version");
    if (vers == 0) {
	warn("Warning: plugin %s has no version information", arg);
    } else if (strcmp(vers, VERSION) != 0) {
	option_error("Plugin %s is for pppd version %s, this is %s",
		     arg, vers, VERSION);
	goto errclose;
    }
    info("Plugin %s loaded.", arg);
    (*init)();
    return 1;

 errclose:
    dlclose(handle);
 err:
    if (path != arg)
	free(path);
    return 0;
}

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.