add error checking on file open

mipsevm/run_unicorn.go

@@ -83,7 +83,8 @@ func GetHookedUnicorn(root string, ram map[uint32](uint32), callback func(int, u
 			oracle_hash, _ := mu.MemRead(0x30001000, 0x20)
 			hash := common.BytesToHash(oracle_hash)
 			key := fmt.Sprintf("%s/%s", root, hash)
-			value, _ := ioutil.ReadFile(key)
+			value, err := ioutil.ReadFile(key)
+      check(err)
 
 			tmp := []byte{0, 0, 0, 0}
 			binary.BigEndian.PutUint32(tmp, uint32(len(value)))
@@ -179,7 +180,9 @@ func RunUnicorn(fn string, ram map[uint32](uint32), checkIO bool, callback func(
 	mu.MemWrite(0, dat)
 
 	// inputs
-	inputs, _ := ioutil.ReadFile(fmt.Sprintf("%s/input", root))
+	inputs, err := ioutil.ReadFile(fmt.Sprintf("%s/input", root))
+  check(err)
+
 	mu.MemWrite(0x30000000, inputs[0:0xc0])
 
 	// load into ram
@@ -191,7 +194,8 @@ func RunUnicorn(fn string, ram map[uint32](uint32), checkIO bool, callback func(
 	mu.Start(0, 0x5ead0004)
 
 	if checkIO {
-		outputs, _ := ioutil.ReadFile(fmt.Sprintf("%s/output", root))
+		outputs, err := ioutil.ReadFile(fmt.Sprintf("%s/output", root))
+    check(err)
 		real := append([]byte{0x13, 0x37, 0xf0, 0x0d}, outputs...)
 		output, _ := mu.MemRead(0x30000800, 0x44)
 		if bytes.Compare(real, output) != 0 {