Commit 774f8bbd authored by J. Bruce Fields's avatar J. Bruce Fields

nfsd: fix startup/shutdown order bug

We must create the server before we can call init_socks or check the
number of threads.

Symptoms were a NULL pointer dereference in nfsd_svc().  Problem
identified by Jeff Layton.

Also fix a minor cleanup-on-error case in nfsd_startup().
Reported-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 039a87ca
......@@ -204,6 +204,9 @@ static bool nfsd_up = false;
static int nfsd_startup(unsigned short port, int nrservs)
{
int ret;
if (nfsd_up)
return 0;
/*
* Readahead param cache - will no-op if it already exists.
* (Note therefore results will be suboptimal if number of
......@@ -217,7 +220,7 @@ static int nfsd_startup(unsigned short port, int nrservs)
goto out_racache;
ret = lockd_up();
if (ret)
return ret;
goto out_racache;
ret = nfs4_state_start();
if (ret)
goto out_lockd;
......@@ -420,7 +423,7 @@ int
nfsd_svc(unsigned short port, int nrservs)
{
int error;
bool first_thread;
bool nfsd_up_before;
mutex_lock(&nfsd_mutex);
dprintk("nfsd: creating service\n");
......@@ -432,29 +435,28 @@ nfsd_svc(unsigned short port, int nrservs)
if (nrservs == 0 && nfsd_serv == NULL)
goto out;
first_thread = (nfsd_serv->sv_nrthreads == 0) && (nrservs != 0);
if (first_thread) {
error = nfsd_startup(port, nrservs);
error = nfsd_create_serv();
if (error)
goto out;
}
error = nfsd_create_serv();
nfsd_up_before = nfsd_up;
error = nfsd_startup(port, nrservs);
if (error)
goto out_shutdown;
goto out_destroy;
error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
if (error)
goto out_destroy;
goto out_shutdown;
/* We are holding a reference to nfsd_serv which
* we don't want to count in the return value,
* so subtract 1
*/
error = nfsd_serv->sv_nrthreads - 1;
out_destroy:
svc_destroy(nfsd_serv); /* Release server */
out_shutdown:
if (error < 0 && first_thread)
if (error < 0 && !nfsd_up_before)
nfsd_shutdown();
out_destroy:
svc_destroy(nfsd_serv); /* Release server */
out:
mutex_unlock(&nfsd_mutex);
return error;
......
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