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* fix(go/grpc): avoid panic on short FlatBuffers input The gRPC codec read the root UOffsetT without checking input size. On buffers shorter than SizeUOffsetT, GetUint32 touched data[3] and the process panics. Add a simple length check and validate the root offset stays within the buffer. Return clear errors (insufficient data / invalid root offset) instead of panicking. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi> * fix(go/grpc): avoid signed overflow in offset Keep the bounds check in the unsigned domain (UOffsetT) to avoid signedness pitfalls. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi> * chore: clarify comment regarding offset A full FlatBuffer structure would be: - uoffset_t: root table offset (4 bytes) - soffset_t: vtable offset in root table (4 bytes) - uint16_t: vtable size (2 bytes) - uint16_t: table size (2 bytes) In total 12 bytes. We are only validating the data length before trying to read the uoffset_t, not the full structure. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi> --------- Signed-off-by: Ville Vesilehto <ville@vesilehto.fi> Co-authored-by: Derek Bailey <derekbailey@google.com>