Fix slow memory drain on each client renegotiation.

This reverts commit bee92b479414d12035b0422f81ac5fcfe14fa645 and parts
of commit dc7be6d078ba106f9b0de12f3e879c3561c3c537, as these introduced a
subtle memory drain on client renegotiations (es->gc got initialized,
which led to "unused" gc_entry records accumulating while a client is
connected).

Setting es->gc=NULL causes env_set_add_nolock() / remove_env_item() to
free() allocated and no longer used strings in the es, while an active
gc would leave them for cleanup with gc_free() at client disconnect time.

Signed-off-by: Gert Doering <gert@greenie.muc.de>

Conflicts:
	src/openvpn/buffer.c
Acked-by: David Sommerseth <dazo@users.sourceforge.net>
Message-Id: <20131023162618.GP161@greenie.muc.de>
URL: http://article.gmane.org/gmane.network.openvpn.devel/7939
(cherry picked from commit 4368147972d61b598bbcd5d2904d891130d5e517)

1 files changed, 19 insertions, 10 deletions

diff --git a/src/openvpn/buffer.c b/src/openvpn/buffer.c
index 56d14b1..fb3b52d 100644
--- a/src/openvpn/buffer.c
+++ b/src/openvpn/buffer.c
@@ -327,19 +327,28 @@ gc_malloc (size_t size, bool clear, struct gc_arena *a)
 #endif
 {
   void *ret;
-  struct gc_entry *e;
-  ASSERT (NULL != a);
-
+  if (a)
+    {
+      struct gc_entry *e;
 #ifdef DMALLOC
-  e = (struct gc_entry *) openvpn_dmalloc (file, line, size + sizeof (struct gc_entry));
+      e = (struct gc_entry *) openvpn_dmalloc (file, line, size + sizeof (struct gc_entry));
 #else
-  e = (struct gc_entry *) malloc (size + sizeof (struct gc_entry));
+      e = (struct gc_entry *) malloc (size + sizeof (struct gc_entry));
 #endif
-  check_malloc_return (e);
-  ret = (char *) e + sizeof (struct gc_entry);
-  e->next = a->list;
-  a->list = e;
-
+      check_malloc_return (e);
+      ret = (char *) e + sizeof (struct gc_entry);
+      e->next = a->list;
+      a->list = e;
+    }
+  else
+    {
+#ifdef DMALLOC
+      ret = openvpn_dmalloc (file, line, size);
+#else
+      ret = malloc (size);
+#endif
+      check_malloc_return (ret);
+    }
 #ifndef ZERO_BUFFER_ON_ALLOC
   if (clear)
 #endif