From f5954e2d940c3a41a6ed0cad45660e254eb381a3 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Tue, 24 Jul 2012 12:05:27 -0400
Subject: [PATCH] prim_import: When importing .drvs, allocate the intermediate
 attrset on the heap just in case it escapes the stack frame.

---
 src/libexpr/primops.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 2ab3eda53..0d4efc47e 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -61,7 +61,7 @@ static void prim_import(EvalState & state, Value * * args, Value & v)
 
     if (isStorePath(path) && store->isValidPath(path) && isDerivation(path)) {
         Derivation drv = parseDerivation(readFile(path));
-        Value w;
+        Value & w = *state.allocValue();
         state.mkAttrs(w, 1 + drv.outputs.size());
         mkString(*state.allocAttr(w, state.sDrvPath), path, singleton<PathSet>("=" + path));
         state.mkList(*state.allocAttr(w, state.symbols.create("outputs")), drv.outputs.size());