From f28084ddda02886a97943e36099c4a523f72af0b Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 7 Mar 2011 23:18:07 -0500
Subject: [PATCH] munge the debug_lock signature before freeing it: it might
 help us catch use-after-free

---
 evthread.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/evthread.c b/evthread.c
index d9c54787..a8b2534f 100644
--- a/evthread.c
+++ b/evthread.c
@@ -156,6 +156,7 @@ debug_lock_free(void *lock_, unsigned locktype)
 	}
 	lock->lock = NULL;
 	lock->count = -100;
+	lock->signature = 0x12300fda;
 	mm_free(lock);
 }