ND_CMD_MAX_ENVELOPE
char *in_env __free(kfree) = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
if (in_len < ND_CMD_MAX_ENVELOPE)
copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
char *out_env __free(kfree) = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
if (out_len < ND_CMD_MAX_ENVELOPE)
copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);