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fix: return error on packet length overflow in TransportLayerCC and CCFeedbackReport - #235
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Return errPacketTooLarge when TransportLayerCC or CCFeedbackReport length overflows the uint16 RTCP header length limit. Also update TransportLayerCC.packetLen to return an int to prevent wrapping. Signed-off-by: Adam Magued <adamismailmageud@gmail.com>
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Fixes #234
Problem
In
TransportLayerCCandCCFeedbackReport,Marshalcalculates the packet length in 32-bit words and casts it to auint16. When a packet contains a large number of deltas or feedback metric blocks such that the payload exceedsmath.MaxUint16words, the integer wraps around. This causes the allocated buffer to be undersized, triggering apanic: runtime error: slice bounds out of rangeduring marshaling.Solution
TransportLayerCC.Marshal/MarshalToandCCFeedbackReport.Marshal/MarshalToreturningerrPacketTooLargewhen the packet size cannot fit within the RTCP length field.transport_layer_cc_test.goandrfc8888_test.goverifying that oversized packets return an error gracefully rather than panicking.Verified via container sandbox test suite.