From a16328449171c1138bce3a9f32b7c1fa211e58d2 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Thu, 16 Sep 2010 20:11:47 +1000
Subject: wbclient: paranoid check for double free

added while tracking down a crash in the wbinfo blackbox test

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
---
 nsswitch/libwbclient/wbclient.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nsswitch/libwbclient/wbclient.c b/nsswitch/libwbclient/wbclient.c
index 15be255d45..19bb3e9e0a 100644
--- a/nsswitch/libwbclient/wbclient.c
+++ b/nsswitch/libwbclient/wbclient.c
@@ -148,6 +148,7 @@ const char *wbcErrorString(wbcErr error)
 }
 
 #define WBC_MAGIC (0x7a2b0e1e)
+#define WBC_MAGIC_FREE (0x875634fe)
 
 struct wbcMemPrefix {
 	uint32_t magic;
@@ -197,6 +198,10 @@ void wbcFreeMemory(void *p)
 	if (wbcMem->magic != WBC_MAGIC) {
 		return;
 	}
+
+	/* paranoid check to ensure we don't double free */
+	wbcMem->magic = WBC_MAGIC_FREE;
+
 	if (wbcMem->destructor != NULL) {
 		wbcMem->destructor(p);
 	}
-- 
cgit