linux-kernel - [PATCH] xprtsock: Fix a loop in xs_tcp_setup

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Date: Sat, 20 Apr 2024 19:48:01 +0900
From: Lex Siegel <usiegl00@...il.com>
To: Chuck Lever <chuck.lever@...cle.com>,
	Jeff Layton <jlayton@...nel.org>,
	Neil Brown <neilb@...e.de>,
	Olga Kornievskaia <kolga@...app.com>,
	Dai Ngo <Dai.Ngo@...cle.com>,
	Tom Talpey <tom@...pey.com>,
	Trond Myklebust <trond.myklebust@...merspace.com>,
	Anna Schumaker <anna@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH] xprtsock: Fix a loop in xs_tcp_setup_socket()

When using a bpf on kernel_connect(), the call can return -EPERM.
This causes xs_tcp_setup_socket() to loop forever, filling up the
syslog and causing the kernel to freeze up.

Signed-off-by: Lex Siegel <usiegl00@...il.com>
---
 net/sunrpc/xprtsock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index bb9b747d58a1..47b254806a08 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2446,6 +2446,8 @@ static void xs_tcp_setup_socket(struct work_struct *work)
 		/* Happens, for instance, if the user specified a link
 		 * local IPv6 address without a scope-id.
 		 */
+	case -EPERM:
+		/* Happens, for instance, if a bpf is preventing the connect */
 	case -ECONNREFUSED:
 	case -ECONNRESET:
 	case -ENETDOWN:
-- 
2.39.3