Fuzz round trip

projects/goipp/fuzzer/fuzz_round_trip.go

@@ -0,0 +1,30 @@
+/*
+ * Fuzz target for goipp's EncodeBytes + DecodeBytes round-trip consistency.
+ */
+package fuzzer
+
+import (
+	"testing"
+
+	"github.com/OpenPrinting/goipp"
+)
+
+func FuzzRoundTrip(f *testing.F) {
+	f.Fuzz(func(t *testing.T, data []byte) {
+		var m goipp.Message
+		if err := m.DecodeBytes(data); err != nil {
+			t.Skip()
+		}
+
+		encoded, err := m.EncodeBytes()
+		if err != nil {
+			t.Errorf("Failed to encode: %v", err)
+			return
+		}
+
+		var m2 goipp.Message
+		if err := m2.DecodeBytes(encoded); err != nil {
+			t.Errorf("Failed to decode re-encoded: %v", err)
+		}
+	})
+}

projects/goipp/oss_fuzz_build.sh

@@ -3,6 +3,7 @@
 mkdir -p $SRC/goipp/fuzzer
 cp $SRC/fuzzing/projects/goipp/fuzzer/fuzz_decode_bytes.go $SRC/goipp/fuzzer/
 cp $SRC/fuzzing/projects/goipp/fuzzer/fuzz_decode_bytes_ex.go $SRC/goipp/fuzzer/
+cp $SRC/fuzzing/projects/goipp/fuzzer/fuzz_round_trip.go $SRC/goipp/fuzzer/
 
 # seed corpus for FuzzDecodeBytes
 mkdir -p $WORK/fuzz_decode_bytes_corpus
@@ -15,6 +16,11 @@ mkdir -p $WORK/fuzz_decode_bytes_ex_corpus
 cp $SRC/fuzzing/projects/goipp/seeds/fuzz_decode_bytes_ex_seed_corpus/* $WORK/fuzz_decode_bytes_ex_corpus/
 zip -r $OUT/fuzz_decode_bytes_ex_seed_corpus.zip fuzz_decode_bytes_ex_corpus/
 
+# seed corpus for FuzzRoundTrip
+mkdir -p $WORK/fuzz_round_trip_corpus
+cp $SRC/fuzzing/projects/goipp/seeds/fuzz_round_trip_seed_corpus/* $WORK/fuzz_round_trip_corpus/
+zip -r $OUT/fuzz_round_trip_seed_corpus.zip fuzz_round_trip_corpus/
+
 
 # build dependencies and fiuzzers
 cd $SRC/goipp
@@ -24,3 +30,4 @@ go get github.com/AdamKorcz/go-118-fuzz-build/testing
 
 compile_native_go_fuzzer github.com/OpenPrinting/goipp/fuzzer FuzzDecodeBytes fuzz_decode_bytes
 compile_native_go_fuzzer github.com/OpenPrinting/goipp/fuzzer FuzzDecodeBytesEx fuzz_decode_bytes_ex
+compile_native_go_fuzzer github.com/OpenPrinting/goipp/fuzzer FuzzRoundTrip fuzz_round_trip