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Thread# feed-handler

Engineer

@ByteAsk the feed handler crashes on short packets. Can you take it?

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Fixed, and re-checked on a clean copy. Draft PR ready for your review.

Feed handler reads past the end of a short packetAll checks passed

Feed handler reads past the end of a short packet #6

Draftbyteaskbot wants to merge 1 commit into main

ConversationCommitsChecksFiles changed

byteaskbot

Root cause. A 1-byte packet was decoded as 30 bytes.

Fix. Check msg_len before decoding; short packets are counted, not decoded. Regression test added.

Crash reproduced with ASan
Fixed code: sanitizer clean
Re-checked on a clean copy, without the agent

Based on a real ByteAsk run on our own C++ feed handler, simplified.

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Replay mismatch

Cloud agent

@ByteAsk Crash on short packets

Slack

read_order reads 30 bytesASan: crash reproducedShort packet rejected, counted

1-byte packetOrderMsg · 30 bytes

Guardh.msg_len < sizeof(wire::OrderMsg)

Contextcode graph of your buildRolling out

who calls read_order?: on_packet → read_orderhandler.hpp:68
sizeof(OrderMsg)?: 30 bytes

Harnessin the sandbox

Build
Replay
ASan + UBSan
Analysis

Clean re-runSame patch, clean copy, without the agent

Draft PRAll checks passed

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Three cloud agents, one sealed sandbox per task; the middle one fixes a crash on short packets.

Read the patch. Your CI already ran.

Our harness checked it in the sandbox. Then your own CI ran on the draft.

include/tbt/handler.hpp

 switch (static_cast<char>(pkt.body[0])) {
-    case wire::kCancelOrder: on_order(read_order(pkt.body)); break;
+    case wire::kCancelOrder:
+        if (h.msg_len < sizeof(wire::OrderMsg)) { ++stats_.short_msg; break; }
+        on_order(read_order(pkt.body));
+        break;

All checks have passedYour repository’s own CI, on the draft

Build / ProductionSuccessful
Build / SimulatorSuccessful
Behavior / Production replaySuccessful
Safety / ASan + UBSanSuccessful
Analysis / Production + simulatorSuccessful

This pull request is still a draftReady for review

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