SUNRPC: Avoid deep recursion in rpc_release_client

In cases where an rpc client has a parent hierarchy, then
rpc_free_client may end up calling rpc_release_client() on the
parent, thus recursing back into rpc_free_client. If the hierarchy
is deep enough, then we can get into situations where the stack
simply overflows.

The fix is to have rpc_release_client() loop so that it can take
care of the parent rpc client hierarchy without needing to
recurse.

Reported-by: Jeff Layton <jlayton@redhat.com>
Reported-by: Weston Andros Adamson <dros@netapp.com>
Reported-by: Bruce Fields <bfields@fieldses.org>
Link: http://lkml.kernel.org/r/2C73011F-0939-434C-9E4D-13A1EB1403D7@netapp.com
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index dab09da..f09b7db 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -750,14 +750,16 @@ EXPORT_SYMBOL_GPL(rpc_shutdown_client);
 /*
  * Free an RPC client
  */
-static void
+static struct rpc_clnt *
 rpc_free_client(struct rpc_clnt *clnt)
 {
+       struct rpc_clnt *parent = NULL;
+
        dprintk_rcu("RPC:       destroying %s client for %s\n",
                        clnt->cl_program->name,
                        rcu_dereference(clnt->cl_xprt)->servername);
        if (clnt->cl_parent != clnt)
-               rpc_release_client(clnt->cl_parent);
+               parent = clnt->cl_parent;
        rpc_clnt_remove_pipedir(clnt);
        rpc_unregister_client(clnt);
        rpc_free_iostats(clnt->cl_metrics);
@@ -766,18 +768,17 @@ rpc_free_client(struct rpc_clnt *clnt)
        rpciod_down();
        rpc_free_clid(clnt);
        kfree(clnt);
+       return parent;
 }
 
 /*
  * Free an RPC client
  */
-static void
+static struct rpc_clnt * 
 rpc_free_auth(struct rpc_clnt *clnt)
 {
-       if (clnt->cl_auth == NULL) {
-               rpc_free_client(clnt);
-               return;
-       }
+       if (clnt->cl_auth == NULL)
+               return rpc_free_client(clnt);
 
        /*
         * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
@@ -788,7 +789,8 @@ rpc_free_auth(struct rpc_clnt *clnt)
        rpcauth_release(clnt->cl_auth);
        clnt->cl_auth = NULL;
        if (atomic_dec_and_test(&clnt->cl_count))
-               rpc_free_client(clnt);
+               return rpc_free_client(clnt);
+       return NULL;
 }
 
 /*
@@ -799,10 +801,13 @@ rpc_release_client(struct rpc_clnt *clnt)
 {
        dprintk("RPC:       rpc_release_client(%p)\n", clnt);
 
-       if (list_empty(&clnt->cl_tasks))
-               wake_up(&destroy_wait);
-       if (atomic_dec_and_test(&clnt->cl_count))
-               rpc_free_auth(clnt);
+       do {
+               if (list_empty(&clnt->cl_tasks))
+                       wake_up(&destroy_wait);
+               if (!atomic_dec_and_test(&clnt->cl_count))
+                       break;
+               clnt = rpc_free_auth(clnt);
+       } while (clnt != NULL);
 }
 EXPORT_SYMBOL_GPL(rpc_release_client);