From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Mon, 26 Aug 2013 21:26:51 +0000 (-0400)
Subject: NFSv4: Fix a potentially Oopsable condition in __nfs_idmap_unregister
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d7631250b20119ea763d9ba461c3a9c5710cfa98;p=linux-beck.git

NFSv4: Fix a potentially Oopsable condition in __nfs_idmap_unregister

Ensure that __nfs_idmap_unregister can be called twice without
consequences.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index e9b0c59f9286..8b7e94ac096b 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -404,8 +404,10 @@ static struct key_type key_type_id_resolver_legacy = {
 
 static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
 {
-	if (pipe->dentry)
+	if (pipe->dentry) {
 		rpc_unlink(pipe->dentry);
+		pipe->dentry = NULL;
+	}
 }
 
 static int __nfs_idmap_register(struct dentry *dir,