add poc for switch int

tests/support/uaf/uaf_swithint/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "uaf_swithint"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

tests/support/uaf/uaf_swithint/src/main.rs

@@ -0,0 +1,33 @@
+use std::mem::ManuallyDrop;
+enum A {
+    A1,
+    A2
+}
+fn evil_test(a: A) {
+    let mut count = 0;
+    let mut slot = ManuallyDrop::<Box<u8>>::new(Box::new(1));
+    loop {
+        if let A::A1 = a {
+            count += 1;
+            if count < 2 {
+                unsafe {
+                    ManuallyDrop::drop(&mut slot);
+                }
+                continue;
+            }
+            break;
+        } else {
+            println!("{:?}", slot);
+            unsafe {
+                ManuallyDrop::drop(&mut slot);
+            }
+            break;
+        }
+    }
+}
+fn main() {
+    let a1 = A::A1;
+    let a2 = A::A2;
+    evil_test(a1);
+    evil_test(a2);
+}