SUNRPC: Ensure get_rpccred() and put_rpccred() can take NULL arguments

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index 6f36b2b..8997915 100644 (file)
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -202,7 +202,8 @@ char *                      rpcauth_stringify_acceptor(struct rpc_cred *);
 static inline
 struct rpc_cred *      get_rpccred(struct rpc_cred *cred)
 {
-       atomic_inc(&cred->cr_count);
+       if (cred != NULL)
+               atomic_inc(&cred->cr_count);
        return cred;
 }
 

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index e0bb30f..040ff62 100644 (file)
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -703,8 +703,7 @@ rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
                new = rpcauth_bind_new_cred(task, lookupflags);
        if (IS_ERR(new))
                return PTR_ERR(new);
-       if (req->rq_cred != NULL)
-               put_rpccred(req->rq_cred);
+       put_rpccred(req->rq_cred);
        req->rq_cred = new;
        return 0;
 }
@@ -712,6 +711,8 @@ rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
 void
 put_rpccred(struct rpc_cred *cred)
 {
+       if (cred == NULL)
+               return;
        /* Fast path for unhashed credentials */
        if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
                if (atomic_dec_and_test(&cred->cr_count))