From 056f57eafd3565fdfef300e7821d6f0280450dd3 Mon Sep 17 00:00:00 2001
From: Adam Paszke <adam.paszke@gmail.com>
Date: Mon, 18 Apr 2016 20:38:55 +0200
Subject: Fix pointer overflows in all cases in sharedserialize

---
 sharedserialize.lua | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/sharedserialize.lua b/sharedserialize.lua
index 9cd8ebf..2a966fd 100644
--- a/sharedserialize.lua
+++ b/sharedserialize.lua
@@ -8,16 +8,32 @@ local _, tds = pcall(require, 'tds') -- for the free/retain functions
 if tds then
    local ffi = require 'ffi'
 
+   local function serializePointer(obj, f)
+      if ffi.sizeof('long') == 4 then
+         f:writeDouble(torch.pointer(obj))
+      else
+         f:writeLong(torch.pointer(obj))
+      end
+   end
+
+   local function deserializePointer(f)
+      if ffi.sizeof('long') == 4 then
+         return f:readDouble()
+      else
+         return f:readLong()
+      end
+   end
+
    -- hash
    local mt = {}
    function mt.__factory(f)
-      local self = f:readLong()
+      local self = deserializePointer(f)
       self = ffi.cast('tds_hash&', self)
       ffi.gc(self, tds.C.tds_hash_free)
       return self
    end
    function mt.__write(self, f)
-      f:writeLong(torch.pointer(self))
+      serializePointer(self, f)
       tds.C.tds_hash_retain(self)
    end
    function mt.__read(self, f)
@@ -27,22 +43,13 @@ if tds then
    -- vec
    local mt = {}
    function mt.__factory(f)
-      local self
-      if ffi.sizeof('long') == 4 then
-         self = f:readDouble()
-      else
-         self = f:readLong()
-      end
+      local self = deserializePointer(f)
       self = ffi.cast('tds_vec&', self)
       ffi.gc(self, tds.C.tds_vec_free)
       return self
    end
    function mt.__write(self, f)
-      if ffi.sizeof('long') == 4 then
-         f:writeDouble(torch.pointer(self))
-      else
-         f:writeLong(torch.pointer(self))
-      end
+      serializePointer(self, f)
       tds.C.tds_vec_retain(self)
    end
    function mt.__read(self, f)
@@ -73,13 +80,13 @@ for _, typename in ipairs{
    local mt = {}
 
    function mt.__factory(f)
-      local self = f:readLong()
+      local self = deserializePointer(f)
       self = torch.pushudata(self, typename)
       return self
    end
 
    function mt.write(self, f)
-      f:writeLong(torch.pointer(self))
+      serializePointer(self, f)
       if typename ~= 'torch.Allocator' then
          self:retain()
       end
-- 
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