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a0a54b8005
Remove repeated extension fields from the set of nullable fields, so that Has reports false and Range does not visit a a zero-length repeated extension field. This corrects a fuzzer-detected case where unmarshaling and remarshaling a wire-format message could result in a semantic change. For a repeated extension field in non-packed encoding, unmarshaling a packed representation of the field would result in a message which Has the extension. Remarshaling it would discard the the field. Fixes golang.org/protobuf#975 Change-Id: Ie836559c93d218db5b5201742a3b8ebbaacf54ed Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/204897 Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com> Reviewed-by: Joe Tsai <joetsai@google.com>