From mboxrd@z Thu Jan 1 00:00:00 1970 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 2A5123C1FD7; Thu, 15 Jan 2026 17:27:24 +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=1768498044; cv=none; b=quVM5SQKQwPpkPa1XiomDcH4R5ZtJsfRXyc6XbXUO8byaqW1N1QBOpjSkDjSP+LlqsrxA9a6ERi5FMzJl1N8AOQ24VAQ5nOLLJs5TxT2zypeWlPI9t3KkUPkDq+YHxtYNNJHZoQ25scHtq+ZuqleT/wc5klINttbw4jvsrZvacU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768498044; c=relaxed/simple; bh=jbaWy38s+zqQFDumk5gFP8ymIKKVw2SyVdzigAgpNWk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ws1Y4qiEhCykQq6gQg8+46mH/r6uE519eupbR6r0Gp+eXHbLiEcHVeU/15oztu2mvXJreBRr6M4pNP+nan9RXUvi+c4HnC0Yis+yQ39BOYziNuITbMTMc1kjs0M2UdvakM/GcyEJdYyN6Jha0m27v1nR7GfbDcx5RINdoNSHf8c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ndfpexeb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ndfpexeb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA7DEC116D0; Thu, 15 Jan 2026 17:27:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768498044; bh=jbaWy38s+zqQFDumk5gFP8ymIKKVw2SyVdzigAgpNWk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ndfpexeb/oFykBwWAVbTWGoBg0kVb6LRy/os+vJ3Ns7mOz5NI1ml2ZuS4sefB+7oT UzwamfSoZaKifAoZT4/MU4waXmlHpguSrjq3XR7aGaLr0MphWOZ7FAoYGgmezrG6VE H9X2QTBr0v/C6GvrhkA5/eRjdCzaXy7TRQkqkJGI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Duoming Zhou Subject: [PATCH 5.15 294/554] usb: phy: fsl-usb: Fix use-after-free in delayed work during device removal Date: Thu, 15 Jan 2026 17:46:00 +0100 Message-ID: <20260115164256.869605605@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164246.225995385@linuxfoundation.org> References: <20260115164246.225995385@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Duoming Zhou commit 41ca62e3e21e48c2903b3b45e232cf4f2ff7434f upstream. The delayed work item otg_event is initialized in fsl_otg_conf() and scheduled under two conditions: 1. When a host controller binds to the OTG controller. 2. When the USB ID pin state changes (cable insertion/removal). A race condition occurs when the device is removed via fsl_otg_remove(): the fsl_otg instance may be freed while the delayed work is still pending or executing. This leads to use-after-free when the work function fsl_otg_event() accesses the already freed memory. The problematic scenario: (detach thread) | (delayed work) fsl_otg_remove() | kfree(fsl_otg_dev) //FREE| fsl_otg_event() | og = container_of(...) //USE | og-> //USE Fix this by calling disable_delayed_work_sync() in fsl_otg_remove() before deallocating the fsl_otg structure. This ensures the delayed work is properly canceled and completes execution prior to memory deallocation. This bug was identified through static analysis. Fixes: 0807c500a1a6 ("USB: add Freescale USB OTG Transceiver driver") Cc: stable Signed-off-by: Duoming Zhou Link: https://patch.msgid.link/20251205034831.12846-1-duoming@zju.edu.cn Signed-off-by: Greg Kroah-Hartman --- drivers/usb/phy/phy-fsl-usb.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/phy/phy-fsl-usb.c +++ b/drivers/usb/phy/phy-fsl-usb.c @@ -987,6 +987,7 @@ static int fsl_otg_remove(struct platfor { struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev); + disable_delayed_work_sync(&fsl_otg_dev->otg_event); usb_remove_phy(&fsl_otg_dev->phy); free_irq(fsl_otg_dev->irq, fsl_otg_dev);