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4.1: the DrmCursor consumer handed the wire body straight to the client, which renders width*height*4 RGBA bytes. Reject a body shorter than that so a truncated cursor cannot make the client read past the buffer. The hidden-cursor sentinel is 0x0 with an empty body, for which the bound is 0 and the check is a no-op. 4.8: the _drm socket is a FIFO, so a consumer that drains slower than we produce (a 4K convert on a modest GPU) fell seconds behind stale frames. Drain the producer channel without blocking each tick and forward only the newest frame; replaced frames drop in place, closing the zero-copy OwnedFd and freeing the CPU-path pixel buffer. Cursor updates stay in order and are never coalesced away.