From b1f7d3aaa021d626b4083ddaa706b26f3521d343 Mon Sep 17 00:00:00 2001
From: "Felix S. Klock II" <pnkfelix@pnkfx.org>
Date: Sat, 23 Aug 2014 17:29:48 +0200
Subject: Copy only up to `min(new_size, old_size)` when doing reallocate.

Fix #16687
---
 src/liballoc/heap.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/liballoc')

diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
index e2faa3240ed..ab686cb01d6 100644
--- a/src/liballoc/heap.rs
+++ b/src/liballoc/heap.rs
@@ -208,6 +208,7 @@ mod imp {
 
 #[cfg(not(jemalloc), unix)]
 mod imp {
+    use core::cmp;
     use core::mem;
     use core::ptr;
     use libc;
@@ -248,7 +249,7 @@ mod imp {
     pub unsafe fn reallocate(ptr: *mut u8, size: uint, align: uint,
                              old_size: uint) -> *mut u8 {
         let new_ptr = allocate(size, align);
-        ptr::copy_memory(new_ptr, ptr as *const u8, old_size);
+        ptr::copy_memory(new_ptr, ptr as *const u8, cmp::min(size, old_size));
         deallocate(ptr, old_size, align);
         return new_ptr;
     }
-- 
cgit 1.4.1-3-g733a5