linux-kernel - [PATCH AUTOSEL 6.1 019/212] SUNRPC: rpcbind should never reset the port to the value '0'

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Message-Id: <20250505230624.2692522-19-sashal@kernel.org>
Date: Mon,  5 May 2025 19:03:11 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Trond Myklebust <trond.myklebust@...merspace.com>,
	Jeff Layton <jlayton@...nel.org>,
	Benjamin Coddington <bcodding@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	chuck.lever@...cle.com,
	trondmy@...nel.org,
	anna@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 019/212] SUNRPC: rpcbind should never reset the port to the value '0'

From: Trond Myklebust <trond.myklebust@...merspace.com>

[ Upstream commit 214c13e380ad7636631279f426387f9c4e3c14d9 ]

If we already had a valid port number for the RPC service, then we
should not allow the rpcbind client to set it to the invalid value '0'.

Reviewed-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: Benjamin Coddington <bcodding@...hat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/rpcb_clnt.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index 82afb56695f8d..1ec20163a0b7d 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -797,9 +797,10 @@ static void rpcb_getport_done(struct rpc_task *child, void *data)
 	}
 
 	trace_rpcb_setport(child, map->r_status, map->r_port);
-	xprt->ops->set_port(xprt, map->r_port);
-	if (map->r_port)
+	if (map->r_port) {
+		xprt->ops->set_port(xprt, map->r_port);
 		xprt_set_bound(xprt);
+	}
 }
 
 /*
-- 
2.39.5