Add a new rule to detect integer overflow on integer types conversion

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

testutils/g115_samples.go

@@ -0,0 +1,118 @@
+package testutils
+
+import "github.com/securego/gosec/v2"
+
+var SampleCodeG115 = []CodeSample{
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a uint32 = math.MaxUint32
+    b := int32(a)
+    fmt.Println(b)
+}
+	`}, 1, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a uint16 = math.MaxUint16
+    b := int32(a)
+    fmt.Println(b)
+}
+	`}, 0, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a uint32 = math.MaxUint32
+    b := uint16(a)
+    fmt.Println(b)
+}
+	`}, 1, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a int32 = math.MaxInt32
+    b := int16(a)
+    fmt.Println(b)
+}
+	`}, 1, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a int16 = math.MaxInt16
+    b := int32(a)
+    fmt.Println(b)
+}
+	`}, 0, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a int32 = math.MaxInt32
+    b := uint32(a)
+    fmt.Println(b)
+}
+	`}, 0, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a uint = math.MaxUint
+    b := int16(a)
+    fmt.Println(b)
+}
+	`}, 1, gosec.NewConfig()},
+	{[]string{`
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+    var a uint = math.MaxUint
+    b := int64(a)
+    fmt.Println(b)
+}
+	`}, 1, gosec.NewConfig()},
+}