[PATCH 1/1] nfsd: initialise nfsd_info.mutex early.

[patricia.domingues at canonical.com]

From: NeilBrown <neilb at suse.de>

BugLink: https://bugs.launchpad.net/bugs/2070358

nfsd_info.mutex can be dereferenced by svc_pool_stats_start()
immediately after the new netns is created.  Currently this can
trigger an oops.

Move the initialisation earlier before it can possibly be dereferenced.

Fixes: 7b207ccd9833 ("svc: don't hold reference for poolstats, only mutex.")
Reported-by: Sourabh Jain <sourabhjain at linux.ibm.com>
Closes: https://lore.kernel.org/all/c2e9f6de-1ec4-4d3a-b18d-d5a6ec0814a0@linux.ibm.com/
Signed-off-by: NeilBrown <neilb at suse.de>
Reviewed-by: Jeff Layton <jlayton at kernel.org>
Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
(cherry picked from commit e0011bca603c101f2a3c007bdb77f7006fa78fb1)
Signed-off-by: Patricia Domingues <patricia.domingues at canonical.com>
---
 fs/nfsd/nfsctl.c | 2 ++
 fs/nfsd/nfssvc.c | 1 -
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index d8f54eb7455e..16b7de26d5b6 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1676,6 +1676,8 @@ static __net_init int nfsd_net_init(struct net *net)
 		goto out_repcache_error;
 	nn->nfsd_versions = NULL;
 	nn->nfsd4_minorversions = NULL;
+	nn->nfsd_info.mutex = &nfsd_mutex;
+	nn->nfsd_serv = NULL;
 	nfsd4_init_leases_net(nn);
 	get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
 	seqlock_init(&nn->writeverf_lock);
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index a667802e08e7..3cff673bfed8 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -677,7 +677,6 @@ int nfsd_create_serv(struct net *net)
 		return error;
 	}
 	spin_lock(&nfsd_notifier_lock);
-	nn->nfsd_info.mutex = &nfsd_mutex;
 	nn->nfsd_serv = serv;
 	spin_unlock(&nfsd_notifier_lock);
 
-- 
2.25.1