linux-kernel - [PATCH v2] net/handshake: restore destructor on submit failure

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Message-ID: <20251204084757.1536523-1-caoping@cmss.chinamobile.com>
Date: Thu,  4 Dec 2025 00:47:56 -0800
From: caoping <caoping@...s.chinamobile.com>
To: chuck.lever@...cle.com
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	kernel-tls-handshake@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	caoping <caoping@...s.chinamobile.com>
Subject: [PATCH v2] net/handshake: restore destructor on submit failure

handshake_req_submit() replaces sk->sk_destruct but never restores it when
submission fails before the request is hashed. handshake_sk_destruct() then
returns early and the original destructor never runs, leaking the socket.
Restore sk_destruct on the error path.

Fixes: 3b3009ea8abb ("net/handshake: Create a NETLINK service for handling handshake requests")

Signed-off-by: caoping <caoping@...s.chinamobile.com>
---
 net/handshake/request.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/handshake/request.c b/net/handshake/request.c
index 274d2c89b6b2..89435ed755cd 100644
--- a/net/handshake/request.c
+++ b/net/handshake/request.c
@@ -276,6 +276,8 @@ int handshake_req_submit(struct socket *sock, struct handshake_req *req,
 out_unlock:
 	spin_unlock(&hn->hn_lock);
 out_err:
+	/* Restore original destructor so socket teardown still runs on failure */
+	req->hr_sk->sk_destruct = req->hr_odestruct;
 	trace_handshake_submit_err(net, req, req->hr_sk, ret);
 	handshake_req_destroy(req);
 	return ret;

base-commit: 4a26e7032d7d57c998598c08a034872d6f0d3945
-- 
2.47.3