linux-kernel - [PATCH v2 0/2] nfc: llcp: fix double put/unlock on LLCP

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Message-Id: <20251217125746.19304-1-pioooooooooip@gmail.com>
Date: Wed, 17 Dec 2025 21:57:44 +0900
From: Qianchang Zhao <pioooooooooip@...il.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Simon Horman <horms@...nel.org>,
	stable@...r.kernel.org,
	Qianchang Zhao <pioooooooooip@...il.com>
Subject: [PATCH v2 0/2] nfc: llcp: fix double put/unlock on LLCP_CLOSED in recv handlers

This series fixes a refcount/locking imbalance in NFC LLCP receive handlers
when the socket is already in LLCP_CLOSED.

nfc_llcp_recv_disc() used to perform release_sock()/nfc_llcp_sock_put() in the CLOSED
branch but did not exit, and then performed the same cleanup again on the common
exit path. Drop the redundant CLOSED-branch cleanup so the common exit path runs
it exactly once, while keeping the existing DM_DISC reply behavior.

nfc_llcp_recv_hdlc() performed the CLOSED cleanup but then continued processing
and later cleaned up again on the common exit path. Return immediately after the
CLOSED cleanup.

Changes in v2:
- Drop Reported-by tags
- Add missing Fixes tags

Build-tested with: make M=net/nfc (no NFC HW available for runtime testing).

Qianchang Zhao (2):
  nfc: llcp: avoid double release/put on LLCP_CLOSED in
    nfc_llcp_recv_disc()
  nfc: llcp: stop processing on LLCP_CLOSED in nfc_llcp_recv_hdlc()

 net/nfc/llcp_core.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

-- 
2.34.1