Fix the call list info to handle selector expressions

Signed-off-by: Cosmin Cojocar <cosmin.cojocar@gmx.ch>

call_list_test.go

@@ -99,7 +99,7 @@ var _ = Describe("Call List", func() {
 		// Create file to be scanned
 		pkg := testutils.NewTestPackage()
 		defer pkg.Close()
-		pkg.AddFile("main.go", testutils.SampleCodeG104[5].Code[0])
+		pkg.AddFile("main.go", testutils.SampleCodeG104[6].Code[0])
 
 		ctx := pkg.CreateContext("main.go")
 

helpers.go

@@ -135,6 +135,14 @@ func GetCallInfo(n ast.Node, ctx *Context) (string, string, error) {
 					return "undefined", fn.Sel.Name, fmt.Errorf("missing type info")
 				}
 				return expr.Name, fn.Sel.Name, nil
+			case *ast.SelectorExpr:
+				if expr.Sel != nil {
+					t := ctx.Info.TypeOf(expr.Sel)
+					if t != nil {
+						return t.String(), fn.Sel.Name, nil
+					}
+					return "undefined", fn.Sel.Name, fmt.Errorf("missing type info")
+				}
 			case *ast.CallExpr:
 				switch call := expr.Fun.(type) {
 				case *ast.Ident:

testutils/source.go

@@ -234,6 +234,23 @@ package main
 func dummy(){}
 `}, 0, gosec.NewConfig()}, {[]string{`
 package main
+
+import (
+	"bytes"
+)
+
+type a struct {
+	buf *bytes.Buffer
+}
+
+func main() {
+	a := &a{
+		buf: new(bytes.Buffer),
+	}
+	a.buf.Write([]byte{0})
+}
+`}, 0, gosec.NewConfig()}, {[]string{`
+package main
 import (
 	"io/ioutil"
 	"os"