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net: check SkipAdditional error result
This will avoid a potential endless loop for a corrupt DNS packet. For #66754 Change-Id: I46591b3f7695bcc88d2312833e45955f8c129d2b Reviewed-on: https://go-review.googlesource.com/c/go/+/578375 Reviewed-by: Damien Neil <dneil@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Commit-Queue: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
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@ -277,7 +277,9 @@ func extractExtendedRCode(p dnsmessage.Parser, hdr dnsmessage.Header) (dnsmessag
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if ahdr.Type == dnsmessage.TypeOPT {
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return ahdr.ExtendedRCode(hdr.RCode), hasAdd
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}
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p.SkipAdditional()
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if err := p.SkipAdditional(); err != nil {
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return hdr.RCode, hasAdd
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}
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}
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}
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