linux-kernel - [PATCH 6.6.y] nfsd: don't ignore the return code of svc_proc

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Message-Id: <20260211030522.2697146-1-jianqkang@sina.cn>
Date: Wed, 11 Feb 2026 11:05:22 +0800
From: Jianqiang kang <jianqkang@...a.cn>
To: gregkh@...uxfoundation.org,
	stable@...r.kernel.org,
	jlayton@...nel.org
Cc: patches@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	chuck.lever@...cle.com,
	neilb@...e.de,
	kolga@...app.com,
	Dai.Ngo@...cle.com,
	tom@...pey.com,
	linux-nfs@...r.kernel.org
Subject: [PATCH 6.6.y] nfsd: don't ignore the return code of svc_proc_register()

From: Jeff Layton <jlayton@...nel.org>

[ Upstream commit 930b64ca0c511521f0abdd1d57ce52b2a6e3476b ]

Currently, nfsd_proc_stat_init() ignores the return value of
svc_proc_register(). If the procfile creation fails, then the kernel
will WARN when it tries to remove the entry later.

Fix nfsd_proc_stat_init() to return the same type of pointer as
svc_proc_register(), and fix up nfsd_net_init() to check that and fail
the nfsd_net construction if it occurs.

svc_proc_register() can fail if the dentry can't be allocated, or if an
identical dentry already exists. The second case is pretty unlikely in
the nfsd_net construction codepath, so if this happens, return -ENOMEM.

Reported-by: syzbot+e34ad04f27991521104c@...kaller.appspotmail.com
Closes: https://lore.kernel.org/linux-nfs/67a47501.050a0220.19061f.05f9.GAE@google.com/
Cc: stable@...r.kernel.org # v6.9
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
[ Update the cleanup path to use nfsd_stat_counters_destroy. This ensures
 the teardown logic is correctly paired with nfsd_stat_counters_init, as
 required by the current NFSD implementation.]
Signed-off-by: Jianqiang kang <jianqkang@...a.cn>
---
 fs/nfsd/nfsctl.c | 9 ++++++++-
 fs/nfsd/stats.c  | 4 ++--
 fs/nfsd/stats.h  | 2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 78ebdf20c1ef..4703e2a93568 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1526,17 +1526,24 @@ static __net_init int nfsd_net_init(struct net *net)
 	retval = nfsd_stat_counters_init(nn);
 	if (retval)
 		goto out_repcache_error;
+
 	memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
 	nn->nfsd_svcstats.program = &nfsd_program;
+	if (!nfsd_proc_stat_init(net)) {
+		retval = -ENOMEM;
+		goto out_proc_error;
+	}
+
 	nn->nfsd_versions = NULL;
 	nn->nfsd4_minorversions = NULL;
 	nfsd4_init_leases_net(nn);
 	get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
 	seqlock_init(&nn->writeverf_lock);
-	nfsd_proc_stat_init(net);
 
 	return 0;
 
+out_proc_error:
+	nfsd_stat_counters_destroy(nn);
 out_repcache_error:
 	nfsd_idmap_shutdown(net);
 out_idmap_error:
diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
index 9f606fa08bd4..0a629a18831f 100644
--- a/fs/nfsd/stats.c
+++ b/fs/nfsd/stats.c
@@ -115,11 +115,11 @@ void nfsd_stat_counters_destroy(struct nfsd_net *nn)
 	nfsd_percpu_counters_destroy(nn->counter, NFSD_STATS_COUNTERS_NUM);
 }
 
-void nfsd_proc_stat_init(struct net *net)
+struct proc_dir_entry *nfsd_proc_stat_init(struct net *net)
 {
 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
-	svc_proc_register(net, &nn->nfsd_svcstats, &nfsd_proc_ops);
+	return svc_proc_register(net, &nn->nfsd_svcstats, &nfsd_proc_ops);
 }
 
 void nfsd_proc_stat_shutdown(struct net *net)
diff --git a/fs/nfsd/stats.h b/fs/nfsd/stats.h
index d2753e975dfd..b1f7d21cbcd1 100644
--- a/fs/nfsd/stats.h
+++ b/fs/nfsd/stats.h
@@ -15,7 +15,7 @@ void nfsd_percpu_counters_reset(struct percpu_counter *counters, int num);
 void nfsd_percpu_counters_destroy(struct percpu_counter *counters, int num);
 int nfsd_stat_counters_init(struct nfsd_net *nn);
 void nfsd_stat_counters_destroy(struct nfsd_net *nn);
-void nfsd_proc_stat_init(struct net *net);
+struct proc_dir_entry *nfsd_proc_stat_init(struct net *net);
 void nfsd_proc_stat_shutdown(struct net *net);
 
 static inline void nfsd_stats_rc_hits_inc(struct nfsd_net *nn)
-- 
2.34.1