Feature: G602 Slice Bound Checking (#973)

* Added slice bounds testing for slice expressions.

* Added checking slice index.

* Added test for reassigning slice.

* Store capacities on reslicing.

* Scope change clears map. Func name used to track slices.

* Map CallExpr to check bounds when passing to functions.

* Fixed linter errors.

* Updated rulelist with CWE mapping.

* Added comment for NewSliceBoundCheck.

* Addressed nil cap runtime error.

* Replaced usage of nil in call arg map with dummy callexprs.

* Updated comments, wrapped error return, addressed other review concerns.

rules/rules_test.go

@@ -194,5 +194,9 @@ var _ = Describe("gosec rules", func() {
 		It("should detect implicit aliasing in ForRange", func() {
 			runner("G601", testutils.SampleCodeG601)
 		})
+
+		It("should detect out of bounds slice access", func() {
+			runner("G602", testutils.SampleCodeG602)
+		})
 	})
 })