From nobody Tue Feb 10 22:15:36 2026 Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 54C2E34B1AC for ; Wed, 17 Dec 2025 12:58:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765976288; cv=none; b=siloYrkpc5rkNrowT0MUDtQ6u6DDpvpZa2FFwMUbxOpatWYMvpzkVhbrR9TQpSrkfZOH6qpqnZvyxnd4K1YfGyK/saKuQbDPplLN8soTwX2WtuUpDF6r0FW7ce8PUSEWgHBTJ8h1XDaVAVnBUpYsuxroRoDXWo1RKnUtUWJtyRc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765976288; c=relaxed/simple; bh=SZnCdTyKaSLAbq/w5ae+5W9P3TCfTqARU6rrGxRItYg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mntokwhcFWOOeQGP5J6KAEYvGHlCi7hOeEXzwOtQmGeb507dymd8oy/Areixjy4kCJBr5JapcqV19c+UEFsYiIhschcrasU9LX7ZJGejgOoZtoiGFC6MvldTrb1HpgmzGpjNVSTEUcpdWnxaiCHIxI6xfEWMV7FSCiW3ryIKftc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=YkZMk3Rf; arc=none smtp.client-ip=209.85.210.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YkZMk3Rf" Received: by mail-pf1-f170.google.com with SMTP id d2e1a72fcca58-7f6282195a9so503155b3a.2 for ; Wed, 17 Dec 2025 04:58:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1765976283; x=1766581083; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=19nxpEKwGS7FQgHQH9ItvDMFClxV8pWJ4CiL9LfKCs0=; b=YkZMk3Rf8izIZxEypeYZRidmU0DRh26aCOQdpNYkAJR5mf8MvE85JHAugxt+0oW4Th ess1vSGrfjA4QpvytxbUmIH0Zz4X/Xk2ei2edGtd4d7rjGgZdFEViQwPUStyJQFe7oGE WHHojGbQ1ux3IWz7XzFbgN6L85YgZAMy5jK6rVmIYQOoOMwPv3uUb6I2cVpihF8Jqn32 vCGzXfawokhnUjt8roT4qDLEPcI25azrhRtZavDi6Y7b8T4/wj7yuBhEGv7+8XNahwid /uvxeV26d+58ms5GUQfrNtbn9j57mb0+IoIL+WODETwpauyhRXw/kyh4y6qsc9OE7cOt RVcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765976283; x=1766581083; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=19nxpEKwGS7FQgHQH9ItvDMFClxV8pWJ4CiL9LfKCs0=; b=MGcASWRXQRXL/ZGBiW3gED1gsnxMB+DQ5ckMp040LorXkwJBFjWaeKIk7xRCuiThzn 6KHbHL40+VCbvqocQC1u6MrIeb1EcEtoWv4U79W+zoDYDpMtMr5dUlOmsomBrf0EmEyP s8GwmK6L68ICJo4Iq9dodbTbHzvZs35ha0/pLmOK3oKt2mYi7AmlL50Z5cfNnJMGtE+z gEzhqlaoGXrW0VMBQzeSmPxsPyPVj9DEkW9EE7e0ifllgioWsUDjWMQKnvB95NeIoA+K EggzJmZ8zHGQTOWdQ9evGoORgm/QB1n9ZCDZLzE0q/g5/d2VIh3vmLqRBxZ9hgronkQS /D1Q== X-Gm-Message-State: AOJu0YzEDDiolE4pDIk0bhXUlIjMWKjYc7wkpoXOWFPPNXjXoaWQY7kC 3lBCF4Rg0pxDCWnUnyzCx8ev5Fe0DFzCda5MsbWQYOkpxreTT8GL/kfhfS/Cjfuw X-Gm-Gg: AY/fxX6jkaKywsCx0+MoZL5RYAbz54Hwypgj7xng6nPTa3GE2PKsYlkda7bwxNh6Sjd x8ZLs3dHNJy9a6tTD1qOwoWw94yMjZAGJ4dfkjdzyW0wa+uEdLB6AVLaebyUrMb6mywJqFcvtXj QzbPcqm2kAjQpsb36scJqMJyJjh2nUmGHYe8sPtovEgsl8QXnWktLpxjH6NRJ2kEH07E9ekFizd 43jOmKe8VliTaOF2Uv+EaToUhwXO37iycLcf/G6VSVJXoOjGfRTiBxe8kl6BxW2BfEnEwWLsX0X GL5rotgNFJs7cWQSbNM8TMNnxs62k5M4PI8lbLg0zWkv2LxT/GBzYC+5Lxdkwos8D3GEtyIgD4L YbK8DIIOX3D/oLBXMtHmtvkrDL8eE9/a2j3SfTiIUIe/xkuN1rA/2eY96QXx352pPerzsgD4wwv ti8ap2krA4R/DbOG5of486gGu46C+3XsSV5rH7BXVFGrxEiy+MlHS6Xp+SQG29gFT+Y/n5roLBR weBS7RMTNU= X-Google-Smtp-Source: AGHT+IGljT05kcE0gnGjJhZSXdc45btqsT9idbNMlheRL+reQ+D2Cuw4RN6rf32Fhx0ASJ9iIYpshg== X-Received: by 2002:a05:6a00:929b:b0:7ab:9850:25fb with SMTP id d2e1a72fcca58-7f667731a61mr12221010b3a.2.1765976283395; Wed, 17 Dec 2025 04:58:03 -0800 (PST) Received: from poi.localdomain (KD118158218050.ppp-bb.dion.ne.jp. [118.158.218.50]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7fd974aeb37sm839335b3a.11.2025.12.17.04.58.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Dec 2025 04:58:02 -0800 (PST) From: Qianchang Zhao To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Paolo Abeni , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Simon Horman , stable@vger.kernel.org, Qianchang Zhao Subject: [PATCH v2 1/2] nfc: llcp: avoid double release/put on LLCP_CLOSED in nfc_llcp_recv_disc() Date: Wed, 17 Dec 2025 21:57:45 +0900 Message-Id: <20251217125746.19304-2-pioooooooooip@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251217125746.19304-1-pioooooooooip@gmail.com> References: <20251217125746.19304-1-pioooooooooip@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" nfc_llcp_sock_get() takes a reference on the LLCP socket via sock_hold(). In nfc_llcp_recv_disc(), when the socket is already in LLCP_CLOSED state, t= he code used to perform release_sock() and nfc_llcp_sock_put() in the CLOSED b= ranch but then continued execution and later performed the same cleanup again on = the common exit path. This results in refcount imbalance (double put) and unbal= anced lock release. Remove the redundant CLOSED-branch cleanup so that release_sock() and nfc_llcp_sock_put() are performed exactly once via the common exit path, wh= ile keeping the existing DM_DISC reply behavior. Fixes: d646960f7986fefb460a2b062d5ccc8ccfeacc3a ("NFC: Initial LLCP support= ") Cc: stable@vger.kernel.org Signed-off-by: Qianchang Zhao --- net/nfc/llcp_core.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c index beeb3b4d2..ed37604ed 100644 --- a/net/nfc/llcp_core.c +++ b/net/nfc/llcp_core.c @@ -1177,11 +1177,6 @@ static void nfc_llcp_recv_disc(struct nfc_llcp_local= *local, =20 nfc_llcp_socket_purge(llcp_sock); =20 - if (sk->sk_state =3D=3D LLCP_CLOSED) { - release_sock(sk); - nfc_llcp_sock_put(llcp_sock); - } - if (sk->sk_state =3D=3D LLCP_CONNECTED) { nfc_put_device(local->dev); sk->sk_state =3D LLCP_CLOSED; --=20 2.34.1