---

yaml
---
r: 80516
b: refs/heads/master
c: e211888
h: refs/heads/master
v: v3

Author: blake2-ppc

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 6e538edea2557018c3c8eae41aacf6cdf6370a4d
+refs/heads/master: e211888407db32fcec53f4fa9eb84acdbdf59f87
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: cbd1eefbd350797b783df119fed7956d7e1c74ad
 refs/heads/try: 71bebebc37fbb229877da88dde13c2f35913bd77

trunk/src/libstd/at_vec.rs

@@ -230,13 +230,16 @@ pub mod raw {
     // Implementation detail. Shouldn't be public
     #[allow(missing_doc)]
     pub fn reserve_raw(ty: *TyDesc, ptr: *mut *mut Box<Vec<()>>, n: uint) {
-
+        // check for `uint` overflow
         unsafe {
-            let size_in_bytes = n * (*ty).size;
-            if size_in_bytes > (**ptr).data.alloc {
-                let total_size = size_in_bytes + sys::size_of::<Vec<()>>();
+            if n > (**ptr).data.alloc / (*ty).size {
+                let alloc = n * (*ty).size;
+                let total_size = alloc + sys::size_of::<Vec<()>>();
+                if alloc / (*ty).size != n || total_size < alloc {
+                    fail!("vector size is too large: %u", n);
+                }
                 (*ptr) = local_realloc(*ptr as *(), total_size) as *mut Box<Vec<()>>;
-                (**ptr).data.alloc = size_in_bytes;
+                (**ptr).data.alloc = alloc;
             }
         }
 

trunk/src/libstd/vec.rs

@@ -3659,6 +3659,14 @@ mod tests {
         v.push(2);
     }
 
+    #[test]
+    #[should_fail]
+    fn test_overflow_does_not_cause_segfault_managed() {
+        let mut v = ~[@1];
+        v.reserve(-1);
+        v.push(@2);
+    }
+
     #[test]
     fn test_mut_split() {
         let mut values = [1u8,2,3,4,5];