The pYData field points to the table of Y values, that must not (and is not) modified by the interpolation function.
As done for other functions, I suggest to const-qualify the field, changing to
const float32_t *pYData; /**< pointer to the table of Y values */
Interpolation functions use Instance structures as this one https://github.com/ARM-software/CMSIS-DSP/blob/d7e4dea51ad19724adcd2c9f82eb42af12e0f5fc/Include/dsp/interpolation_functions.h#L50-L59
The
pYData
field points to the table of Y values, that must not (and is not) modified by the interpolation function. As done for other functions, I suggest to const-qualify the field, changing toAnd so on, wherever is necessary.