From 8577186e7804a0006c7da9915457e8d29745efb1 Mon Sep 17 00:00:00 2001
From: racequite <quiterace@gmail.com>
Date: Sun, 2 Aug 2026 01:47:33 +0800
Subject: [PATCH] wasmtime-cache: Reject overflowing duration values

---
 crates/cache/src/config.rs       |  6 +++---
 crates/cache/src/config/tests.rs | 21 +++++++++++++++++++++
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/crates/cache/src/config.rs b/crates/cache/src/config.rs
index beef58d28270..bc39f87a78cc 100644
--- a/crates/cache/src/config.rs
+++ b/crates/cache/src/config.rs
@@ -262,9 +262,9 @@ macro_rules! generate_deserializer {
 generate_deserializer!(deserialize_duration(num: u64, unit: &str) -> Duration {
     match unit {
         "s" => Some(Duration::from_secs(num)),
-        "m" => Some(Duration::from_secs(num * 60)),
-        "h" => Some(Duration::from_secs(num * 60 * 60)),
-        "d" => Some(Duration::from_secs(num * 60 * 60 * 24)),
+        "m" => num.checked_mul(60).map(Duration::from_secs),
+        "h" => num.checked_mul(60 * 60).map(Duration::from_secs),
+        "d" => num.checked_mul(60 * 60 * 24).map(Duration::from_secs),
         _ => None,
     }
 });
diff --git a/crates/cache/src/config/tests.rs b/crates/cache/src/config/tests.rs
index a605c9e216b7..c88ae84c870a 100644
--- a/crates/cache/src/config/tests.rs
+++ b/crates/cache/src/config/tests.rs
@@ -400,6 +400,27 @@ fn test_duration_settings() {
     );
 }
 
+#[test]
+fn test_duration_overflow() {
+    let (_td, cd, cp) = test_prolog();
+
+    for (num, unit) in [
+        (u64::MAX / 60 + 1, "m"),
+        (u64::MAX / (60 * 60) + 1, "h"),
+        (u64::MAX / (60 * 60 * 24) + 1, "d"),
+    ] {
+        let content = format!(
+            "[cache]\ndirectory = '{}'\ncleanup-interval = '{num}{unit}'",
+            cd.display()
+        );
+        fs::write(&cp, content).expect("Failed to write test config file");
+        assert!(
+            CacheConfig::from_file(Some(&cp)).is_err(),
+            "duration {num}{unit} should overflow"
+        );
+    }
+}
+
 #[test]
 fn test_percent_settings() {
     let (_td, cd, cp) = test_prolog();