nilassign

nilassign

nilassign finds that assigning to invalid memory address or nil pointer dereference.

Instruction

go install github.com/sivchari/nilassign/cmd/nilassign

Usage

package main

func main() {
	{
		var i *int
		*i = 2 // ng
	}

	{
		n := &Node{}
		n.Val = 1 // ok

		*n.Pval = 1                 // ng
		n.Node.Val = 1              // ng
		n.Node.Node.Val = 1         // ng
		n.ChildNode = &Node{Val: 1} // ok
		n.PVal = &num               // ok

	}
}

type Node struct {
	Val  int
	Pval *int
	Node *Node
}

fish

go vet -vettool=(which nilassign) ./...

./main.go:6:3: this assignment occurs invalid memory address or nil pointer dereference
./main.go:13:3: this assignment occurs invalid memory address or nil pointer dereference
./main.go:14:3: this assignment occurs invalid memory address or nil pointer dereference
./main.go:15:3: this assignment occurs invalid memory address or nil pointer dereference

bash

$ go vet -vettool=`which nilassign` ./...

./main.go:6:3: this assignment occurs invalid memory address or nil pointer dereference
./main.go:13:3: this assignment occurs invalid memory address or nil pointer dereference
./main.go:14:3: this assignment occurs invalid memory address or nil pointer dereference
./main.go:15:3: this assignment occurs invalid memory address or nil pointer dereference

CI

CircleCI

- run:
    name: Install nilassign
    command: go get github.com/sivchari/nilassign

- run:
    name: Run nilassign
    command: go vet -vettool=`which nilassign` ./...

GitHub Actions

- name: Install nilassign
  run: go get github.com/sivchari/nilassign

- name: Run nilassign
  run: go vet -vettool=`which nilassign` ./...