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**RED commit:** `65d9f57b` (CI run will appear at https://github.com/Kpa-clawbot/CoreScope/actions after PR opens) Fixes #1211 ## Root cause `decodePath()` returns `bytesConsumed = hash_size * hash_count` where both come straight from the wire-supplied `pathByte` (upper 2 bits → `hash_size`, lower 6 bits → `hash_count`). Max claimable: 4 × 63 = 252 bytes. A malformed packet on the wire claimed `pathByte=0xF6` (hash_size=4, hash_count=54 → 216 path bytes) inside a 15-byte buffer. The inner hop-extraction loop in `decodePath` did break early on overflow — but `bytesConsumed` was still returned at face value (216). `DecodePacket` then did `offset += 216` (offset=218) and `payloadBuf := buf[offset:]` panicked with the prod-observed signature: ``` runtime error: slice bounds out of range [218:15] ``` The handler-level `defer/recover` at `cmd/ingestor/main.go:258-263` caught it, but the message was silently dropped with no usable diagnostic. ## Fix Add a `if offset > len(buf)` guard at BOTH decoder sites (same pattern, same panic potential): - `cmd/ingestor/decoder.go` — DecodePacket after decodePath - `cmd/server/decoder.go` — DecodePacket after decodePath Return a descriptive error citing the claimed length and pathByte hex so operators can reproduce. Also: `cmd/ingestor/main.go` decode-error log now includes `topic`, `observer`, and `rawHexLen` so future malformed packets are reproducible without needing to attach a debugger. ## Tests (TDD red → green) Both packages got two new tests: - **`TestDecodePacketBoundsFromWire_Issue1211`** — feeds the exact wire shape from the prod log (`pathByte=0xF6` inside a 15-byte buf). Asserts `DecodePacket` does NOT panic and returns an error. - **`TestDecodePacketFuzzTruncated_Issue1211`** — sweeps every `(header, pathByte)` combination with tails 0..19 bytes (≈1.3M inputs). Asserts zero panics. ### Red commit proof On commit `65d9f57b` (RED), both tests fail with the panic: ``` === RUN TestDecodePacketBoundsFromWire_Issue1211 decoder_test.go:1996: DecodePacket panicked on malformed input: runtime error: slice bounds out of range [218:15] --- FAIL: TestDecodePacketBoundsFromWire_Issue1211 (0.00s) === RUN TestDecodePacketFuzzTruncated_Issue1211 decoder_test.go:2010: DecodePacket panicked during fuzz: runtime error: slice bounds out of range [3:2] --- FAIL: TestDecodePacketFuzzTruncated_Issue1211 (0.01s) ``` On commit `7a6ae52c` (GREEN), full suites pass: - `cmd/ingestor`: `ok 53.988s` - `cmd/server`: `ok 29.456s` ## Acceptance criteria - [x] Identify the slice op producing `[218:15]` — `payloadBuf := buf[offset:]` in `DecodePacket` (decoder.go), where `offset` had been advanced by an unchecked `bytesConsumed` from `decodePath()`. - [x] Bounds check added at the identified site(s) — both ingestor and server decoders. - [x] Test with crafted payload (length-field > remaining buffer) — `TestDecodePacketBoundsFromWire_Issue1211`. - [x] Log topic, observer ID, payload byte length on drop — updated `MQTT [%s] decode error` log line. - [x] Existing tests stay green — confirmed both packages. ## Out of scope Reconnect-after-disconnect (#1212) — handled by a separate subagent. This PR touches NO reconnect logic. --------- Co-authored-by: corescope-bot <bot@corescope.local> Co-authored-by: openclaw-bot <bot@openclaw.local> Co-authored-by: corescope-bot <bot@corescope>