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vm: fix bug in GetContextScriptHash()

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v.Istack.Peek(n) can return nil pointer, so .Value() on this pointer
leads to panic here. Fixed by adding nil check.
This commit is contained in:
Anna Shaleva 2020-04-30 19:19:31 +03:00
parent d1ec01c45e
commit 9ecac14aee
1 changed files with 5 additions and 1 deletions
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6
pkg/vm/context.go
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@ -226,7 +226,11 @@ func (c *Context) String() string {
// GetContextScriptHash returns script hash of the invocation stack element // GetContextScriptHash returns script hash of the invocation stack element
// number n. // number n.
func (v *VM) GetContextScriptHash(n int) util.Uint160 { func (v *VM) GetContextScriptHash(n int) util.Uint160 {
ctxIface := v.Istack().Peek(n).Value() element := v.Istack().Peek(n)
if element == nil {
return util.Uint160{}
}
ctxIface := element.Value()
ctx := ctxIface.(*Context) ctx := ctxIface.(*Context)
return ctx.ScriptHash() return ctx.ScriptHash()
} }