From nobody Sat Sep 26 12:30:54 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EA1839B4AE; Tue, 1 Sep 2026 14:27:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788272852; cv=none; b=r5c9MybvRl6LOyo+PT7dyq4kfZmeGUz9wW3cWBJQFo+KZIhSOWOERjUU5HxX5L6p43o9MB4tlW82phIptnyE+5lQlIO0lV2khBF7H/O+LZNxmAzcYkVClx/ZZLgCFoUxqF+qzQFCfUvf1xpJdMv0Qaj32AcKHt2OFpSHeLNydsU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788272852; c=relaxed/simple; bh=ayXG/jvgjksUsoG5Zuky6iIAa4acDBqzBWCCEmft+nU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=YGU+6+7ZlVZvJy5gJgrGgTHBBFSABKxs+6Pdt91seRUAMoEIAYxjS3gQC/y8NCztSIj+BBrl27bN+WMpVqQZaktmAv5aH8hQFMdzDInqQOiA/xwh2Ona1oM8TW+YG9oMyJH0eHZtHsVBeH4tABLoy1yqnd0gC8thLq/pZleaYvU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qTHsXZ18; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qTHsXZ18" Received: by smtp.kernel.org (Postfix) with ESMTPS id D5172C2BCF4; Tue, 1 Sep 2026 14:27:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1788272851; bh=ayXG/jvgjksUsoG5Zuky6iIAa4acDBqzBWCCEmft+nU=; h=From:Date:Subject:To:Cc:Reply-To:From; b=qTHsXZ18zeT8pkOYni7a8myFwZ9SCUcUccGE+cOBYEiy7Se/I9L+orcucaYVV91gk CCssl9BgWOt40RNiQ1kiQd+gC1QJdB6XA4HfxMiLLP3Unmdc8pxOHNgPrstW3Mlrxf VwoAdaFGPqHSt5ry+zfxG9D0F17+igruFP9MAhKbfnJFhGoa/kp6i+7FSRKresP6fA ANnPbCea4i2OhDphD2PYtFIRY4ydA9nj2ltMK06M+DP2sljyTqooaq9mURUSydDyR8 bIXEgFfj70xq6QXfkW9n1zj4oXyGMCEKbUX2DeRPuOEvIKmXCdu/dfmYgGTeZGfwQd 5EdxYI9G1sFmQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id B23ADC624D3; Tue, 1 Sep 2026 14:27:31 +0000 (UTC) From: Ji-Ze Hong via B4 Relay Date: Tue, 01 Sep 2026 22:27:19 +0800 Subject: [PATCH] can: usb: f81604: fix use-after-free on disconnect Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260901-f81604-fix-v1-1-c55b5178f9f8@fintek.com.tw> X-B4-Tracking: v=1; b=H4sIAMbglmoC/yWMQQ5AMBBFryKz1mQqNLiKWFRNGQukRSTi7gbL9 3/euyBSYIpQJxcEOjjyMgvoNAE32nkgxb0wZJgZrFArX2qDufJ8qipHJKvlKgyIsAaS+Ys17c9 x7yZy21uA+34AizRzPW4AAAA= X-Change-ID: 20260901-f81604-fix-9400ea120256 To: Marc Kleine-Budde , Vincent Mailhol Cc: linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, "Ji-Ze Hong (Peter Hong)" X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1788272851; l=1272; i=peter_hong@fintek.com.tw; s=20260824; h=from:subject:message-id; bh=OrmVvmr1snDnaMTisWi/0+p/lhxiIIgiSJYL9JzLpr4=; b=XxfwAoT2qzgD1EcOdZuJy4uyNCRmVLd5sYBtJb2g9t8gVAedH+Hu4tvDhomxjSWAzawGHXY/B 8cOYq9PH3ScD3YgIOhmirZwZUdGJfj/BzwZtrsOYfZNM1CpM6UUl57b X-Developer-Key: i=peter_hong@fintek.com.tw; a=ed25519; pk=8sYixQfVOzNMM+g53fxG9d3MHOFC02ZggNS0OhG5LMA= X-Endpoint-Received: by B4 Relay for peter_hong@fintek.com.tw/20260824 with auth_id=973 X-Original-From: "Ji-Ze Hong (Peter Hong)" Reply-To: peter_hong@fintek.com.tw From: "Ji-Ze Hong (Peter Hong)" Unregister the URBs before cancelling clear_reg_work to prevent an URB completion handler from scheduling work after cancel_work_sync() has returned. Otherwise the pending work may run after the netdev and private data are freed, resulting in a use-after-free. Suggested-by: Marc Kleine-Budde Closes: https://lore.kernel.org/all/20260824133009.CF85A1F00A3A@smtp.kernel= .org/ Cc: stable@vger.kernel.org Signed-off-by: Ji-Ze Hong (Peter Hong) --- drivers/net/can/usb/f81604.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/can/usb/f81604.c b/drivers/net/can/usb/f81604.c index 4c147b9d6d69..bb155b876924 100644 --- a/drivers/net/can/usb/f81604.c +++ b/drivers/net/can/usb/f81604.c @@ -1075,10 +1075,10 @@ static int f81604_close(struct net_device *netdev) f81604_set_reset_mode(priv); =20 netif_stop_queue(netdev); - cancel_work_sync(&priv->clear_reg_work); close_candev(netdev); =20 f81604_unregister_urbs(priv); + cancel_work_sync(&priv->clear_reg_work); =20 return 0; } --- base-commit: 475cb4ea138f4b0e7f43ff79220f4013a6a840b8 change-id: 20260901-f81604-fix-9400ea120256 Best regards, -- =20 Ji-Ze Hong (Peter Hong)