From nobody Mon Jun 8 06:22:35 2026 Received: from mail-qk1-f195.google.com (mail-qk1-f195.google.com [209.85.222.195]) (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 9DAEB360EE4 for ; Tue, 2 Jun 2026 23:35:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.195 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780443313; cv=none; b=W9eESuU3DfuZ1z89CXkgp36cK0MsMnqwk5YS7J5zXcfKwzd4k+W3ktRMFPeDQqnsfbNeqIALQEMrwSAtVEU6gelVCaSz3pVbjQYF8dW0mBCVtcs6rdptALvPfkzZ+8avcjcxocNHQmXxc8vL+AQT294ZMD/q0RthJhI0aVgI5b8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780443313; c=relaxed/simple; bh=5WGH1E3+q5dh3QjHIL39ElESPr6aOtwdfQlqg2sCihk=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=ZsiJ9KDDOZDw1AgUC008DmtBNZ2E8hbrssFYfpkTyxKp2Jogs9doIeNxzZnbU7yxIqwiHkvLrCnfiwa6D7K2ky76AhsHlGaus14OxALIxt0M5Df50d7qgp/DVAJtJ//gzwjN8mrsENAFIZjkNvaa6yRnX94GbQYRlrupGlmENag= 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=j4Bs36Of; arc=none smtp.client-ip=209.85.222.195 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="j4Bs36Of" Received: by mail-qk1-f195.google.com with SMTP id af79cd13be357-9157ec935c5so163737585a.2 for ; Tue, 02 Jun 2026 16:35:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1780443311; x=1781048111; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=VH9hbNCtShw6JmD3y+vRYHGyk8aXTiMz2VCmZ5+oy/k=; b=j4Bs36OfD9vPcXRXDzRnj7GhNMKtMb1bl92WBVTzdp3dvBVIk8FZJTy5w1p4ThpE8i rdk38YY/CRVPqJTg5dbDgcqciNk4yBHwWdrR4PI7mN0EiVrRhvl6BJy/YP/F4mmPhiJr gDBWP64MobxVBSaz7E+rDpUcwZtVvG26rA+o5U4f9hli93nTA2fE6xYuDO2zjwM8VMAr ofwC70j/CPW7WpjzNmd2eQOLJgRuExWLXtxdW3zg0tuwZyvLYr1Se7huJH3HfjnEtnjF 3sAa4D4XgxguUnniHPtI0q7sEEf3Z6VD3P9otNt/T1h8S0IFRS75Yj6W45pAI7OMDVH+ oXiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780443311; x=1781048111; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=VH9hbNCtShw6JmD3y+vRYHGyk8aXTiMz2VCmZ5+oy/k=; b=jJHesAzjrat2Sig7+yuh3OfJeE9GqxD2BFwEiiwRfq+wC8RMwxPji63VSCqr/OtnAc hAIzIjZilotUNfUB0PW2dRfW/ESAi93lrph5m6N9t8zrIc8XLpIsYdSc25XpYFgpCN2w /iCITwSMfwnsmj4RjJJy91XBfyVV1zzn+ClX8P2ojPE4rpfv8l/XJqOifeGwda+aagOJ HkjoXKb5PEuC99URywd1osOJw12EYpJcoVW/1h8xQAPlzwaTee6UwDS6B3mS+H1Rt1ko fkGYxuAYQkVO6jaHhKoZK8sNXe+ZIBYE7vn7yW6e9OwKgRqDa0ZkIfB1RGeWqaNQdFPl bXfQ== X-Forwarded-Encrypted: i=1; AFNElJ8YhhmeuqGEo78i6KP7TnImS9+6LteyN0Nv+VhFmDpvsjh5apQbAZV8XsVSWVRW0mCRqqTfPQ/E6sutbXA=@vger.kernel.org X-Gm-Message-State: AOJu0YyF7Vjprz1IzmLEfRY1pTsGcAq/mP9/NFm+FuIu/+TLDREvAmjP 6YC+GMpWDcW1konapHor3eQKSdoiS38nlSzeZXboCDN3YTUzO1LflSU= X-Gm-Gg: Acq92OFziw71hCD59kqESDdYyecg8oS9tix1e/BX5NmJdeqe4bN2OF467VesJOxOd2h O9wiBWIPljVIBdWieTeWKYaN8L4tdjuWXqXomRuD+yfdW2U2LBkpPamizeuhYQDHnFBZD9d1jOj uDRtaMzNeApRvv3d1/yaWfB5rvaUG3A9at2PMWhMhQbDK8a0nz+XLywCeNYDGN33FkqeQUwhWRQ wWMoLbwHhcvE7S0A+qI31gJSSES0pCDSxDQzy8Jl2ulMn3Oh6hZw55B6Zzyfn6h9/B/qdfVLNr7 a/VFriMXTC4ZK+BZqbf6IA/Tx09Rt7AMmbRgz/srct9EsvUPMLXr8M/DDTdkb8NdcSChOheo5jc a5iGFb2KNBsSG8bGxEI66LFeIgWm+hjiSuVqcz87jhkkgpH34jwfjVnxnL6P3Lrpas82zhJKsPy eAtq0DRkruEE/WyXKPROtzMrJb1w== X-Received: by 2002:a05:620a:318f:b0:915:5379:b511 with SMTP id af79cd13be357-9158a8095a8mr225650285a.43.1780443311386; Tue, 02 Jun 2026 16:35:11 -0700 (PDT) Received: from rainbow ([146.70.171.112]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9158a2465e7sm84251085a.19.2026.06.02.16.35.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2026 16:35:11 -0700 (PDT) From: Jordan Walters To: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Bluetooth: Fix Use-After-Free in hci_unregister_dev Date: Tue, 2 Jun 2026 19:34:14 -0400 Message-ID: <20260602233414.209730-1-jaggyaur@gmail.com> X-Mailer: git-send-email 2.54.0 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" The hci_unregister_dev() function fails to disable the cmd_timer and ncmd_t= imer before freeing the hci_dev structure. If an asynchronous event or timeout o= ccurs during device teardown, the timer callbacks may execute after the device has been freed, leading to a KASAN slab-use-after-free panic. This patch adds the necessary disable_delayed_work_sync() calls to securely= flush the timers before the teardown sequence proceeds. Signed-off-by: Jordan Walters --- net/bluetooth/hci_core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 28d7929dc59..1cbc666527c 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -2671,6 +2671,8 @@ void hci_unregister_dev(struct hci_dev *hdev) disable_work_sync(&hdev->tx_work); disable_work_sync(&hdev->power_on); disable_work_sync(&hdev->error_reset); + disable_delayed_work_sync(&hdev->cmd_timer); + disable_delayed_work_sync(&hdev->ncmd_timer); =20 hci_cmd_sync_clear(hdev);