From 5e92a254b239466cce6fc40de4090a2d54c87ee8 Mon Sep 17 00:00:00 2001
From: Evgeniy Stratonikov <evgeniy@nspcc.ru>
Date: Wed, 2 Jun 2021 11:46:54 +0300
Subject: [PATCH] compiler: check event name length in `runtime.Notify`

---
 pkg/compiler/inline.go       |  7 +++++++
 pkg/compiler/syscall_test.go | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/pkg/compiler/inline.go b/pkg/compiler/inline.go
index 7832b6c9d..6c5b676ce 100644
--- a/pkg/compiler/inline.go
+++ b/pkg/compiler/inline.go
@@ -1,10 +1,12 @@
 package compiler
 
 import (
+	"fmt"
 	"go/ast"
 	"go/constant"
 	"go/types"
 
+	"github.com/nspcc-dev/neo-go/pkg/core/interop/runtime"
 	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
 	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
 )
@@ -134,6 +136,11 @@ func (c *codegen) processNotify(f *funcScope, args []ast.Expr) {
 		}
 
 		name := constant.StringVal(tv.Value)
+		if len(name) > runtime.MaxEventNameLen {
+			c.prog.Err = fmt.Errorf("event name '%s' should be less than %d",
+				name, runtime.MaxEventNameLen)
+			return
+		}
 		c.emittedEvents[name] = append(c.emittedEvents[name], params)
 	}
 }
diff --git a/pkg/compiler/syscall_test.go b/pkg/compiler/syscall_test.go
index 86adb3306..048362af2 100644
--- a/pkg/compiler/syscall_test.go
+++ b/pkg/compiler/syscall_test.go
@@ -188,6 +188,17 @@ func TestNotify(t *testing.T) {
 	assert.Equal(t, exp0, s.events[0].Item.Value())
 	assert.Equal(t, "single", s.events[1].Name)
 	assert.Equal(t, []stackitem.Item{}, s.events[1].Item.Value())
+
+	t.Run("long event name", func(t *testing.T) {
+		src := `package foo
+		import "github.com/nspcc-dev/neo-go/pkg/interop/runtime"
+		func Main(arg int) {
+			runtime.Notify("long event12345678901234567890123")
+		}`
+
+		_, _, err := compiler.CompileWithDebugInfo("foo.go", strings.NewReader(src))
+		require.Error(t, err)
+	})
 }
 
 func TestSyscallInGlobalInit(t *testing.T) {