go/storage/mkvs: Fuzz node unmarshaller

go/.codecov.yml

@@ -5,3 +5,6 @@ ignore:
   - "oasis-test-runner" # E2E test runner.
   - "oasis-net-runner" # Test local network runner.
   - "staking/gen_vectors" # Staking test vector generator.
+  - "storage/fuzz" # Fuzz tests.
+  - "storage/mkvs/urkel/fuzz" # Fuzz tests.
+  - "consensus/tendermint/fuzz" # Fuzz tests.

go/Makefile

@@ -73,7 +73,8 @@ integrationrunner:
 fuzz-targets := fuzz-consensus \
 	fuzz-storage \
 	fuzz-mkvs/Tree \
-	fuzz-mkvs/Proof
+	fuzz-mkvs/Proof \
+	fuzz-mkvs/Node
 
 define canned-fuzz-run
 @TARGETDIR=$(shell pwd)/$<; \
@@ -111,6 +112,8 @@ fuzz-mkvs/Tree: storage/mkvs/urkel/fuzz
 	$(canned-fuzz-run)
 fuzz-mkvs/Proof: storage/mkvs/urkel/fuzz
 	$(canned-fuzz-run)
+fuzz-mkvs/Node: storage/mkvs/urkel/fuzz
+	$(canned-fuzz-run)
 
 # Target that only builds all fuzzing infrastructure.
 build-fuzz: FUZZ_BUILD_ONLY=1

go/storage/mkvs/urkel/fuzz/node.go

@@ -0,0 +1,18 @@
+// +build gofuzz
+
+package fuzz
+
+import "github.com/oasislabs/oasis-core/go/storage/mkvs/urkel/node"
+
+func FuzzNode(data []byte) int {
+    n, err := node.UnmarshalBinary(data)
+    if err != nil {
+        return 0
+    }
+
+    _, err = n.CompactMarshalBinary()
+    if err != nil {
+        panic(err)
+    }
+    return 1
+}