Update Go version in CI script (#913)

* Update Go version in CI script

* Introduce back an additional check for filepath clean to fix the unit tests

Author: ccojocar

.github/workflows/ci.yml

@@ -11,8 +11,8 @@ jobs:
     strategy:
       matrix:
         go_version:
-          - '1.18.8' # TODO: remove this once actions/setup-go@v3 uses latest as latest; see https://github.com/securego/gosec/pull/880
-          - '1.19.3' # TODO: remove this once actions/setup-go@v3 uses latest as latest; see https://github.com/securego/gosec/pull/880
+          - '1.18.9' # TODO: remove this once actions/setup-go@v3 uses latest as latest; see https://github.com/securego/gosec/pull/880
+          - '1.19.4' # TODO: remove this once actions/setup-go@v3 uses latest as latest; see https://github.com/securego/gosec/pull/880
     runs-on: ubuntu-latest
     env:
       GO111MODULE: on
@@ -44,7 +44,7 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.19.2' # TODO: remove this once actions/setup-go@v3 uses latest as latest; see https://github.com/securego/gosec/pull/880
+          go-version: '1.19.4' # TODO: remove this once actions/setup-go@v3 uses latest as latest; see https://github.com/securego/gosec/pull/880
       - name: Checkout Source 
         uses: actions/checkout@v3
       - uses: actions/cache@v3

rules/readfile.go

@@ -59,10 +59,20 @@ func (r *readfile) isJoinFunc(n ast.Node, c *gosec.Context) bool {
 }
 
 // isFilepathClean checks if there is a filepath.Clean for given variable
-func (r *readfile) isFilepathClean(n *ast.Ident) bool {
+func (r *readfile) isFilepathClean(n *ast.Ident, c *gosec.Context) bool {
 	if _, ok := r.cleanedVar[n.Obj.Decl]; ok {
 		return true
 	}
+	if n.Obj.Kind != ast.Var {
+		return false
+	}
+	if node, ok := n.Obj.Decl.(*ast.AssignStmt); ok {
+		if call, ok := node.Rhs[0].(*ast.CallExpr); ok {
+			if clean := r.clean.ContainsPkgCallExpr(call, c, false); clean != nil {
+				return true
+			}
+		}
+	}
 	return false
 }
 
@@ -101,7 +111,7 @@ func (r *readfile) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
 				obj := c.Info.ObjectOf(ident)
 				if _, ok := obj.(*types.Var); ok &&
 					!gosec.TryResolve(ident, c) &&
-					!r.isFilepathClean(ident) {
+					!r.isFilepathClean(ident, c) {
 					return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
 				}
 			}