[PATCH 5.10 298/770] nfsd: rpc_peeraddr2str needs rcu lock

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: J. Bruce Fields <bfields@xxxxxxxxxx>

[ Upstream commit 05570a2b01117209b500e1989ce8f1b0524c489f ]

I'm not even sure cl_xprt can change here, but we're getting "suspicious
RCU usage" warnings, and other rpc_peeraddr2str callers are taking the
rcu lock.

Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/nfsd/nfs4callback.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 59dc80ecd3764..97f517e9b4189 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -941,8 +941,10 @@ static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *c
 		clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
 	clp->cl_cb_client = client;
 	clp->cl_cb_cred = cred;
+	rcu_read_lock();
 	trace_nfsd_cb_setup(clp, rpc_peeraddr2str(client, RPC_DISPLAY_NETID),
 			    args.authflavor);
+	rcu_read_unlock();
 	return 0;
 }
 
-- 
2.43.0







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