p2p/discv5: make idx bounds checking more sound (#17571)
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@ -1228,7 +1228,7 @@ func (net *Network) checkTopicRegister(data *topicRegister) (*pong, error) {
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if rlpHash(data.Topics) != pongpkt.data.(*pong).TopicHash {
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return nil, errors.New("topic hash mismatch")
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}
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if int(data.Idx) < 0 || int(data.Idx) >= len(data.Topics) {
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if data.Idx >= uint(len(data.Topics)) {
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return nil, errors.New("topic index out of range")
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}
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return pongpkt.data.(*pong), nil
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