commit 1772539a42ab91ee3d03a6b86df8df959853d1dc
author Paul J. Davis <paul.joseph.davis@gmail.com> Wed Jun 06 19:24:53 2012 -0500
committer Paul J. Davis <paul.joseph.davis@gmail.com> Wed Jun 06 19:24:53 2012 -0500
tree 1a2b9ef9fea3b075b8a085ac9a045e6684c68834
parent 0bf440d141f467b07970833b4f94669dc21af0e3

Be paranoid about the values sent to upgrade

The docs aren't entirely clear on the order of calls for upgrades so
this is mostly just in case old_priv ever happens to not be what load
returned in priv.

c_src/jiffy.c

diff --git a/c_src/jiffy.c b/c_src/jiffy.c
index a764ed0..5d34a9c 100644
--- a/c_src/jiffy.c
+++ b/c_src/jiffy.c
@@ -42,7 +42,8 @@
 static int
 upgrade(ErlNifEnv* env, void** priv, void** old_priv, ERL_NIF_TERM info)
 {
-    enif_free(*old_priv);
+    if(*old_priv != NULL)
+        enif_free(*old_priv);
     return load(env, priv, info);
 }