GROUP_FILTER_SIZE
gsf_size = GROUP_FILTER_SIZE(num);
len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
if (optlen < GROUP_FILTER_SIZE(0))
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
len = GROUP_FILTER_SIZE(num);
len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
if (optlen < GROUP_FILTER_SIZE(0))
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)