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When parsing a field literal containing two Huffman-encoded strings, don't decode the first string until verifying all data is present. Avoids forced quadratic complexity when repeatedly parsing a partial field, repeating the Huffman decoding of the string on each iteration. Thanks to Philippe Antoine (Catena cyber) for reporting this issue. Fixes golang/go#57855 Fixes CVE-2022-41723 Change-Id: I58a743df450a4a4923dddd5cf6bb0592b0a7bdf3 Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1688184 TryBot-Result: Security TryBots <security-trybots@go-security-trybots.iam.gserviceaccount.com> Reviewed-by: Julie Qiu <julieqiu@google.com> Run-TryBot: Damien Neil <dneil@google.com> Reviewed-by: Roland Shoemaker <bracewell@google.com> Reviewed-on: https://go-review.googlesource.com/c/net/+/468135 Run-TryBot: Michael Pratt <mpratt@google.com> Reviewed-by: Roland Shoemaker <roland@golang.org> Reviewed-by: Than McIntosh <thanm@google.com> Auto-Submit: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>