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Clamping ray to projection space

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I'm trying to trace a ray through a light frustum, and at this point I'm trying to clamp the cam to pixel ray to the projection space of the light. I can enhance this to the actual frustum soon. This is what I've got in case the camera is behind the light. I'm wondering if this is correct and if I can then modify this to clamp on all the planes. Also, would it be beneficial to do this on the CPU? I didn't want to do it because I'm already finding the pixel position in light projection space on the gpu already. I am however getting the camera in light space on the cpu.

if (camPosInLPS.z < 0)
float3 camToPixelLPS = (iPixelLPS - camPosInLPS);
camPosInLPS += camToPixelLPS * abs(camPosInLPS.z) / camToPixelLPS.z;

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