Fix null dereference in call_allocate

In call_allocate we need to reach the auth in order to factor au_cslack
into the allocation.

As of a17c2153d2e271b0cbacae9bed83b0eaa41db7e1 "SUNRPC: Move the bound
cred to struct rpc_rqst", call_allocate attempts to do this by
dereferencing tk_client->cl_auth, however this is not guaranteed to be
defined--cl_auth can be zero in the case of gss context destruction (see
rpc_free_auth).

Reorder the client state machine to bind credentials before allocating,
so that we can instead reach the auth through the cred.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 2388d83..657aac6 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -931,7 +931,7 @@ call_reserveresult(struct rpc_task *task)
        task->tk_status = 0;
        if (status >= 0) {
                if (task->tk_rqstp) {
-                       task->tk_action = call_allocate;
+                       task->tk_action = call_refresh;
                        return;
                }
 
@@ -972,7 +972,7 @@ call_reserveresult(struct rpc_task *task)
 static void
 call_allocate(struct rpc_task *task)
 {
-       unsigned int slack = task->tk_client->cl_auth->au_cslack;
+       unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
        struct rpc_rqst *req = task->tk_rqstp;
        struct rpc_xprt *xprt = task->tk_xprt;
        struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
@@ -980,7 +980,7 @@ call_allocate(struct rpc_task *task)
        dprint_status(task);
 
        task->tk_status = 0;
-       task->tk_action = call_refresh;
+       task->tk_action = call_bind;
 
        if (req->rq_buffer)
                return;
@@ -1042,7 +1042,7 @@ call_refreshresult(struct rpc_task *task)
        dprint_status(task);
 
        task->tk_status = 0;
-       task->tk_action = call_bind;
+       task->tk_action = call_allocate;
        if (status >= 0 && rpcauth_uptodatecred(task))
                return;
        switch (status) {