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SUNRPC: Fix Oops in pmap_getport_done 

There is no guarantee that the parent task still exists when we exit from
the portmapper. Save the xprt instead.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-09-03 00:51:55 -04:00
parent 6b6ca86b77
commit 762d4527c2
1 changed files with 22 additions and 24 deletions
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46
net/sunrpc/pmap_clnt.c
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@ -30,7 +30,7 @@ struct portmap_args {
u32 pm_vers;
u32 pm_prot;
unsigned short pm_port;
struct rpc_task * pm_task;
struct rpc_xprt * pm_xprt;
};
static struct rpc_procinfo pmap_procedures[];
@ -71,10 +71,10 @@ static const struct rpc_call_ops pmap_getport_ops = {
.rpc_release = pmap_map_release,
};
static inline void pmap_wake_portmap_waiters(struct rpc_xprt *xprt)
static inline void pmap_wake_portmap_waiters(struct rpc_xprt *xprt, int status)
{
xprt_clear_binding(xprt);
rpc_wake_up(&xprt->binding);
rpc_wake_up_status(&xprt->binding, status);
}
/**
@ -92,6 +92,7 @@ void rpc_getport(struct rpc_task *task)
struct portmap_args *map;
struct rpc_clnt *pmap_clnt;
struct rpc_task *child;
int status;
dprintk("RPC: %4d rpc_getport(%s, %u, %u, %d)\n",
task->tk_pid, clnt->cl_server,
@ -107,34 +108,30 @@ void rpc_getport(struct rpc_task *task)
}
/* Someone else may have bound if we slept */
if (xprt_bound(xprt)) {
task->tk_status = 0;
status = 0;
if (xprt_bound(xprt))
goto bailout_nofree;
}
status = -ENOMEM;
map = pmap_map_alloc();
if (!map) {
task->tk_status = -ENOMEM;
if (!map)
goto bailout_nofree;
}
map->pm_prog = clnt->cl_prog;
map->pm_vers = clnt->cl_vers;
map->pm_prot = xprt->prot;
map->pm_port = 0;
map->pm_task = task;
map->pm_xprt = xprt_get(xprt);
rpc_peeraddr(clnt, (struct sockaddr *) &addr, sizeof(addr));
pmap_clnt = pmap_create(clnt->cl_server, &addr, map->pm_prot, 0);
if (IS_ERR(pmap_clnt)) {
task->tk_status = PTR_ERR(pmap_clnt);
status = PTR_ERR(pmap_clnt);
if (IS_ERR(pmap_clnt))
goto bailout;
}
status = -EIO;
child = rpc_run_task(pmap_clnt, RPC_TASK_ASYNC, &pmap_getport_ops, map);
if (IS_ERR(child)) {
task->tk_status = -EIO;
if (IS_ERR(child))
goto bailout;
}
rpc_release_task(child);
rpc_sleep_on(&xprt->binding, task, NULL, NULL);
@ -144,8 +141,10 @@ void rpc_getport(struct rpc_task *task)
bailout:
pmap_map_free(map);
xprt_put(xprt);
bailout_nofree:
pmap_wake_portmap_waiters(xprt);
task->tk_status = status;
pmap_wake_portmap_waiters(xprt, status);
}
#ifdef CONFIG_ROOT_NFS
@ -201,29 +200,28 @@ int rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int pr
static void pmap_getport_done(struct rpc_task *child, void *data)
{
struct portmap_args *map = data;
struct rpc_task *task = map->pm_task;
struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_xprt *xprt = map->pm_xprt;
int status = child->tk_status;
if (status < 0) {
/* Portmapper not available */
xprt->ops->set_port(xprt, 0);
task->tk_status = status;
} else if (map->pm_port == 0) {
/* Requested RPC service wasn't registered */
xprt->ops->set_port(xprt, 0);
task->tk_status = -EACCES;
status = -EACCES;
} else {
/* Succeeded */
xprt->ops->set_port(xprt, map->pm_port);
xprt_set_bound(xprt);
task->tk_status = 0;
status = 0;
}
dprintk("RPC: %4d pmap_getport_done(status %d, port %u)\n",
child->tk_pid, child->tk_status, map->pm_port);
child->tk_pid, status, map->pm_port);
pmap_wake_portmap_waiters(xprt);
pmap_wake_portmap_waiters(xprt, status);
xprt_put(xprt);
}
/**