From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (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 C4CB6478870 for ; Wed, 13 May 2026 15:05:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778684725; cv=none; b=rCVLvJ+R93GtbbJugGSGdPf2jZsVdr6+vATGEMzcPH2wni1HaLw1CD4sLRTJu9D1FCquNMhbx/G4x6QC414GAnFs5zh1DYOr1xGX3Or8dZ5XlrAXEbsgWv3bOBUfRjIfwvKKePBbTnw6nciRd+V9FxYc76+y0FM186258D4E9sM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778684725; c=relaxed/simple; bh=TY5LAW5T0Q46o3F/BrwLU+uTPiuSwGLPqe9gXyroDN8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=TwrNde3z7Lk4BvyUBH/jTMqn2Oo4sDgAURtLeDpFKQ9poJOvG+vu44Q/31gRcOJH6W/yCj7MNi7EnaYMyKE4z8EFP/eR4P0JEQX/zxogXIxzDLavJq2QNCBN9AUiSyP80okzPY60I7AInPRXl58PHEQB8hZNz7u3wcIgxgBGRlg= 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=hyNEaex2; arc=none smtp.client-ip=209.85.128.48 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="hyNEaex2" Received: by mail-wm1-f48.google.com with SMTP id 5b1f17b1804b1-4891cd5927dso6195005e9.0 for ; Wed, 13 May 2026 08:05:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778684722; x=1779289522; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=DNKpWb2v7e1+HtXK95De7TC/an+HY3mrnyponhhlU8M=; b=hyNEaex2dpKip9hm5qrYoFLz+OAbnokyVqm0849XseAUZb04Xj6a+z/Dh1oDxi4KCx rj5iyUcMUwl5yggGGDS/sRFbo+HmIC/4mxLYN61WD0XPi6E32baY5zazD4eCVGRCbLL1 sfqKJcd892yDgRlDqSxpd8WhHzx7EWz2D3oLuad4crzqW2KUfJ9abdZHtV4HgjErRxNK cYhBMVPJ616KY8kHCV8TXo4n7LJM+kPFIwPax4Y1G3cCgaw3fAaiCaehRHU1w7uAKUWz sqjgtF/6TvD61lVpymcHHTj2dh8p70Z90T4L+rbdmfL71IOdFRxtRcHTmfPaukL2bHr3 tkzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778684722; x=1779289522; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=DNKpWb2v7e1+HtXK95De7TC/an+HY3mrnyponhhlU8M=; b=ke2EegxABfMIILWknOtJ5GyRH+uXofjdI5gRUGa/jQnQPYR2t/ZFb55eIeLsMAMFe7 7ldE324dit/UJLULeldARdwrx2Li9C+hyXPe1Pg86FABJ+LWcXDHNmW1V3+hZSJs37VB hWjtshgRs12eXVTf70x4R9HtOLISiAmEBrd5YiwduFcUx8+lfdZYfXt4RRHaa1wHsFc+ 9euwA0b6k62gGHcE7DfhtzOPV2itcdIOEbH1fSGeoaUDoOZWKHZG0+zyR2kqY1t1jhzP R25MoKuLctfl80d/VDaqeBZRYB3pKcnqO5beKtQQAGqfboRAcurfbtZn+hF8wPhPgBNu K3uQ== X-Forwarded-Encrypted: i=1; AFNElJ+XTm9OPamOfjgsUFiiGfin/xuEJSInZ+Z9bpUeikFuIsXHzDCJjJGia0b+YyDYmhN0yOZj/G3+6AMBHMU=@vger.kernel.org X-Gm-Message-State: AOJu0YzS4H6JRMJViozssAj7htFF12q2xnK7wccCgn8IQOkZAIKatTl4 u6CxnFTdcVBlvwWwI/EqvGFINpGpoyuPBiuZPkgi9XlZcsNL8C93MYgl X-Gm-Gg: Acq92OEURxVrTs12g4gTlGp+Elj2CUCxfSuBYfvRP/PyI9wsqZ4m0CDXeGksTwxh62I YHNFIu3ldD5TezEU6SLhqVJ0Izh4FW0226Ds6wPIdfaDr9Bf4E2H4PJObGXvjSfsYrAJ988aG8f h8E2qIoRFRD7QRQ+zBaKg6G4HEVJJJRtG7aJZac99yLm6V6rQBtVpIFQQvfs34GB8qbb0Tnt7mv 4Vm4eGzwC77P6hb9iq0TFV+rzvq5mZpBAmvOZ7yw+6IRNOJan7eF/vs4WjMoKyH5G+Lr5Iiqits q2gKYZo9C46EzuE5Xtosc123Z13anzuI9IwoyS+VhoGyycUL/U2fVJ1tY2LotSGInRLa206VjlY SR/7uC+mhpo81DRjyWEFuv8iarcuMW7K9emhHH4ABLO/Fxn/jaZB5V7rap07/iJpMk/vBJUOoln ri0nMetkxDh1Z1wiC+xekdNv1zS5cUANdDxIidPiR4rZ7k X-Received: by 2002:a05:600c:3042:b0:48f:d410:605e with SMTP id 5b1f17b1804b1-48fd4106119mr6816645e9.7.1778684721908; Wed, 13 May 2026 08:05:21 -0700 (PDT) Received: from localhost.localdomain ([82.215.118.79]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fd62792f6sm91365e9.14.2026.05.13.08.05.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2026 08:05:21 -0700 (PDT) From: Stepan Ionichev To: ilpo.jarvinen@linux.intel.com Cc: andriy.shevchenko@linux.intel.com, gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, sozdayvek@gmail.com Subject: [PATCH] serial: 8250-dw: unregister 8250 port if clk_notifier_register() fails Date: Wed, 13 May 2026 20:05:03 +0500 Message-Id: <20260513150503.11037-1-sozdayvek@gmail.com> X-Mailer: git-send-email 2.33.0.windows.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit dw8250_probe() registers the 8250 port via serial8250_register_8250_port() and then, if the device has a clock, registers a clock notifier: data->data.line = serial8250_register_8250_port(up); if (data->data.line < 0) return data->data.line; ... if (data->clk) { err = clk_notifier_register(data->clk, &data->clk_notifier); if (err) return dev_err_probe(dev, err, "Failed to set the clock notifier\n"); ... } If clk_notifier_register() fails, probe returns the error but leaves the 8250 port registered. The matching serial8250_unregister_port() lives in dw8250_remove(), which is not called when probe fails, so the port slot in the serial8250 array stays occupied until the device is rebound or the system is rebooted. The devm-allocated driver data is freed while the port still references it (via the saved private_data and serial_in/serial_out callbacks), so any access to that port slot before a rebind would be a use-after-free. Unregister the port on the clk_notifier_register() error path. Signed-off-by: Stepan Ionichev --- drivers/tty/serial/8250/8250_dw.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 94beadb40..7dbd79a91 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -850,8 +850,10 @@ static int dw8250_probe(struct platform_device *pdev) */ if (data->clk) { err = clk_notifier_register(data->clk, &data->clk_notifier); - if (err) + if (err) { + serial8250_unregister_port(data->data.line); return dev_err_probe(dev, err, "Failed to set the clock notifier\n"); + } queue_work(system_dfl_wq, &data->clk_work); } -- 2.43.0