bounds-check OnUserControlMessage like sibling control handlers#3329
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sahvx655-wq wants to merge 1 commit into
Open
bounds-check OnUserControlMessage like sibling control handlers#3329sahvx655-wq wants to merge 1 commit into
sahvx655-wq wants to merge 1 commit into
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the sibling control-message handlers (OnSetChunkSize, OnAck, OnWindowAckSize, OnSetPeerBandwidth) all validate message_length before touching the body, but OnUserControlMessage only caps the upper bound at 32. reading the code, a user control message with length 0 or 1 reads the 2-byte event type past the end of the stack buffer, and message_length - 2 underflows (uint32_t) to roughly 4G for the event_data StringPiece. require at least 2 bytes up front like the siblings do.