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 C8001359FB0; Fri, 9 Jan 2026 12:06:51 +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=1767960411; cv=none; b=RHRHBHcmuUZ57R7KL+tWe1YiIHcqaYUWPJfcaTW84rnpZUb1HfjKpgMZ9GlHhsyDfHm8JpLyc3qs55OPUp5iyuUygmx8rpcO22VHAZj2peG5lGTYxnZeBhL3uL+wmb3zwYIAS/msN6hsA4gPjNtRFuq6z+GPSJvjlDVrzvmveeM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960411; c=relaxed/simple; bh=ZnfdM2ZNn5OawAqJ5hnTrHDYEkv7uf3lIFGglFSmG9U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YZqiBfNQirEfrIUJfrxZiJA2EawSEvGNGn2YtRh5bxdaHYVIrAZQe+4OXWmmAspsbZbSt4D8ET03e4GEs8IuLR9wsshY52Li3sxthamCEjWqO/8N0fdFmvwdXFl8xNyfiZnqB/Ml4C4GjWwURmWIpYADRHg2zTJ1ALQdcTP15Hw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ql17fNG7; 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="ql17fNG7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5201EC4CEF1; Fri, 9 Jan 2026 12:06:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767960411; bh=ZnfdM2ZNn5OawAqJ5hnTrHDYEkv7uf3lIFGglFSmG9U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ql17fNG7T1vbjh6fvTpqAsrnQTeRBEE0DKmbDovJcPKicoj0mOT/fiDs/wKoTb6KP DlGyRMZMFigHZftFB7KModHua6lEml76KA4syL2qxi8Ur3VpDHNVoDxPRg6EJTownJ A1hzn0SCZFkrzI1LKlVAbP+VbzeW2IvTCrBMnjlg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo , Guenter Roeck , Sasha Levin Subject: [PATCH 6.6 361/737] hwmon: (ibmpex) fix use-after-free in high/low store Date: Fri, 9 Jan 2026 12:38:20 +0100 Message-ID: <20260109112147.575881385@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo [ Upstream commit 6946c726c3f4c36f0f049e6f97e88c510b15f65d ] The ibmpex_high_low_store() function retrieves driver data using dev_get_drvdata() and uses it without validation. This creates a race condition where the sysfs callback can be invoked after the data structure is freed, leading to use-after-free. Fix by adding a NULL check after dev_get_drvdata(), and reordering operations in the deletion path to prevent TOCTOU. Reported-by: Yuhao Jiang Reported-by: Junrui Luo Fixes: 57c7c3a0fdea ("hwmon: IBM power meter driver") Signed-off-by: Junrui Luo Link: https://lore.kernel.org/r/MEYPR01MB7886BE2F51BFE41875B74B60AFA0A@MEYPR01MB7886.ausprd01.prod.outlook.com Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/ibmpex.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/ibmpex.c b/drivers/hwmon/ibmpex.c index db066b368918..40fff7e95ea1 100644 --- a/drivers/hwmon/ibmpex.c +++ b/drivers/hwmon/ibmpex.c @@ -282,6 +282,9 @@ static ssize_t ibmpex_high_low_store(struct device *dev, { struct ibmpex_bmc_data *data = dev_get_drvdata(dev); + if (!data) + return -ENODEV; + ibmpex_reset_high_low_data(data); return count; @@ -514,6 +517,9 @@ static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data) { int i, j; + hwmon_device_unregister(data->hwmon_dev); + dev_set_drvdata(data->bmc_device, NULL); + device_remove_file(data->bmc_device, &sensor_dev_attr_reset_high_low.dev_attr); device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr); @@ -527,8 +533,7 @@ static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data) } list_del(&data->list); - dev_set_drvdata(data->bmc_device, NULL); - hwmon_device_unregister(data->hwmon_dev); + ipmi_destroy_user(data->user); kfree(data->sensors); kfree(data); -- 2.51.0