[glib] Fix g_hash_table_foreach crash with NULL hash table

[Christophe Fergeau <teuf src gnome org>]

commit 6d3b31a533d74b727bca5ac720a81eacb8aee31e
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Thu Feb 9 17:59:55 2012 +0100

    Fix g_hash_table_foreach crash with NULL hash table
    
    When G_DISABLE_ASSERT is not defined, g_hash_table_foreach and
    g_hash_table_find dereferences the hash table argument before
    checking if it's NULL. This causes a crash when one of this function
    is mistakenly called with a NULL argument instead of returning
    with a warning through g_return_if_fail.

 glib/ghash.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/glib/ghash.c b/glib/ghash.c
index b058d17..e204a40 100644
--- a/glib/ghash.c
+++ b/glib/ghash.c
@@ -1504,12 +1504,16 @@ g_hash_table_foreach (GHashTable *hash_table,
 {
   gint i;
 #ifndef G_DISABLE_ASSERT
-  gint version = hash_table->version;
+  gint version;
 #endif
 
   g_return_if_fail (hash_table != NULL);
   g_return_if_fail (func != NULL);
 
+#ifndef G_DISABLE_ASSERT
+  version = hash_table->version;
+#endif
+
   for (i = 0; i < hash_table->size; i++)
     {
       guint node_hash = hash_table->hashes[i];
@@ -1558,13 +1562,17 @@ g_hash_table_find (GHashTable *hash_table,
 {
   gint i;
 #ifndef G_DISABLE_ASSERT
-  gint version = hash_table->version;
+  gint version;
 #endif
   gboolean match;
 
   g_return_val_if_fail (hash_table != NULL, NULL);
   g_return_val_if_fail (predicate != NULL, NULL);
 
+#ifndef G_DISABLE_ASSERT
+  version = hash_table->version;
+#endif
+
   match = FALSE;
 
   for (i = 0; i < hash_table->size; i++)