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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: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2010-08-02 14:12:44 -04:00
parent 039a87ca53
commit 774f8bbd9e
1 changed files with 16 additions and 14 deletions
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30
fs/nfsd/nfssvc.c
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@ -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);
if (error)
goto out;
}
error = nfsd_create_serv();
if (error)
goto out_shutdown;
error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
goto out;
nfsd_up_before = nfsd_up;
error = nfsd_startup(port, nrservs);
if (error)
goto out_destroy;
error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
if (error)
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_shutdown:
if (error < 0 && !nfsd_up_before)
nfsd_shutdown();
out_destroy:
svc_destroy(nfsd_serv); /* Release server */
out_shutdown:
if (error < 0 && first_thread)
nfsd_shutdown();
out:
mutex_unlock(&nfsd_mutex);
return error;