Tie SASL callbacks lifecycle to virNetSessionSASLContext

The array of sasl_callback_t callbacks which is passed to sasl_client_new()
must be kept alive as long as the created sasl_conn_t object is alive as
cyrus-sasl uses this structure internally for things like logging, so
the memory used for callbacks must only be freed after sasl_dispose() has
been called.

During testing of successful SASL logins with
virsh -c qemu+tls:///system list --all
I've been getting invalid read reports from valgrind

==9237== Invalid read of size 8
==9237==    at 0x6E93B6F: _sasl_getcallback (common.c:1745)
==9237==    by 0x6E95430: _sasl_log (common.c:1850)
==9237==    by 0x16593D87: digestmd5_client_mech_dispose (digestmd5.c:4580)
==9237==    by 0x6E91653: client_dispose (client.c:332)
==9237==    by 0x6E9476A: sasl_dispose (common.c:851)
==9237==    by 0x4E225A1: virNetSASLSessionDispose (virnetsaslcontext.c:678)
==9237==    by 0x4CBC551: virObjectUnref (virobject.c:262)
==9237==    by 0x4E254D1: virNetSocketDispose (virnetsocket.c:1042)
==9237==    by 0x4CBC551: virObjectUnref (virobject.c:262)
==9237==    by 0x4E2701C: virNetSocketEventFree (virnetsocket.c:1794)
==9237==    by 0x4C965D3: virEventPollCleanupHandles (vireventpoll.c:583)
==9237==    by 0x4C96987: virEventPollRunOnce (vireventpoll.c:652)
==9237==    by 0x4C94730: virEventRunDefaultImpl (virevent.c:274)
==9237==    by 0x12C7BA: vshEventLoop (virsh.c:2407)
==9237==    by 0x4CD3D04: virThreadHelper (virthreadpthread.c:161)
==9237==    by 0x7DAEF32: start_thread (pthread_create.c:309)
==9237==    by 0x8C86EAC: clone (clone.S:111)
==9237==  Address 0xe2d61b0 is 0 bytes inside a block of size 168 free'd
==9237==    at 0x4A07577: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==9237==    by 0x4C73827: virFree (viralloc.c:580)
==9237==    by 0x4DE4BC7: remoteAuthSASL (remote_driver.c:4219)
==9237==    by 0x4DE33D0: remoteAuthenticate (remote_driver.c:3639)
==9237==    by 0x4DDBFAA: doRemoteOpen (remote_driver.c:832)
==9237==    by 0x4DDC8DC: remoteConnectOpen (remote_driver.c:1031)
==9237==    by 0x4D8595F: do_open (libvirt.c:1239)
==9237==    by 0x4D863F3: virConnectOpenAuth (libvirt.c:1481)
==9237==    by 0x12762B: vshReconnect (virsh.c:337)
==9237==    by 0x12C9B0: vshInit (virsh.c:2470)
==9237==    by 0x12E9A5: main (virsh.c:3338)

This commit changes virNetSASLSessionNewClient() to take ownership of the SASL
callbacks. Then we can free them in virNetSASLSessionDispose() after the corresponding
sasl_conn_t has been freed.

src/remote/remote_driver.c

@@ -4033,6 +4033,8 @@ remoteAuthSASL(virConnectPtr conn, struct private_data *priv,
                                             virNetClientRemoteAddrString(priv->client),
                                             saslcb)))
         goto cleanup;
+    /* saslcb is now owned by sasl */
+    saslcb = NULL;
 
 # ifdef WITH_GNUTLS
     /* Initialize some connection props we care about */

src/rpc/virnetsaslcontext.c

@@ -44,6 +44,7 @@ struct _virNetSASLSession {
 
     sasl_conn_t *conn;
     size_t maxbufsize;
+    sasl_callback_t *callbacks;
 };
 
 
@@ -167,7 +168,7 @@ virNetSASLSessionPtr virNetSASLSessionNewClient(virNetSASLContextPtr ctxt ATTRIB
                                                 const char *hostname,
                                                 const char *localAddr,
                                                 const char *remoteAddr,
-                                                const sasl_callback_t *cbs)
+                                                sasl_callback_t *cbs)
 {
     virNetSASLSessionPtr sasl = NULL;
     int err;
@@ -191,6 +192,7 @@ virNetSASLSessionPtr virNetSASLSessionNewClient(virNetSASLContextPtr ctxt ATTRIB
                        err, sasl_errstring(err, NULL, NULL));
         goto cleanup;
     }
+    sasl->callbacks = cbs;
 
     return sasl;
 
@@ -674,5 +676,5 @@ void virNetSASLSessionDispose(void *obj)
 
     if (sasl->conn)
         sasl_dispose(&sasl->conn);
-
+    VIR_FREE(sasl->callbacks);
 }

src/rpc/virnetsaslcontext.h

@@ -49,7 +49,7 @@ virNetSASLSessionPtr virNetSASLSessionNewClient(virNetSASLContextPtr ctxt,
                                                 const char *hostname,
                                                 const char *localAddr,
                                                 const char *remoteAddr,
-                                                const sasl_callback_t *cbs);
+                                                sasl_callback_t *cbs);
 virNetSASLSessionPtr virNetSASLSessionNewServer(virNetSASLContextPtr ctxt,
                                                 const char *service,
                                                 const char *localAddr,