[PATCH 3/3] nfsd4: Fix error handling in nfsd's callback client

[J. Bruce Fields]

Coverity noticed that the error handling code in the NFSv4 callback client
sets cb->cb_client to NULL, then calls rpc_shutdown_client with the NULL
pointer.

Coverity: #cid 1397

Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
Signed-off-by: J. Bruce Fields <bfields at citi.umich.edu>
---
 fs/nfsd/nfs4callback.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index f6ca9fb..324a278 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -421,7 +421,7 @@ nfsd4_probe_callback(struct nfs4_client 
 
 	/* Create RPC client */
 	cb->cb_client = rpc_create(&args);
-	if (!cb->cb_client) {
+	if (IS_ERR(cb->cb_client)) {
 		dprintk("NFSD: couldn't create callback client\n");
 		goto out_err;
 	}
@@ -448,10 +448,10 @@ nfsd4_probe_callback(struct nfs4_client 
 out_rpciod:
 	atomic_dec(&clp->cl_count);
 	rpciod_down();
-	cb->cb_client = NULL;
 out_clnt:
 	rpc_shutdown_client(cb->cb_client);
 out_err:
+	cb->cb_client = NULL;
 	dprintk("NFSD: warning: no callback path to client %.*s\n",
 		(int)clp->cl_name.len, clp->cl_name.data);
 }
-- 
1.4.2.3.gabd697