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 5BA2E175BF; Wed, 23 Apr 2025 14:54:36 +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=1745420076; cv=none; b=UnX7d+Cio12iFRl84xw65gZJYvWLjZmmlOXNf2lXBOF7pLXPL2KPMB3JRSMfdcYXKoLAmundxAQwqcfwfhW4IDvVkPscoNuHEuBeKo3QL/Hs6iGlMUN0gOtllgza2QnlUXsWYyFpIUqwWkg+SXi12h1X9A99HjX5WyVEJCar66M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745420076; c=relaxed/simple; bh=HkK9F02ZSU2e2MfaqlbpJJ3BGpv92mF0EvJeMXjuAXs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QrPp4jdqaF1NUY7mgYkHsHv2z4NPa1pP3TsBcT+9OzHgjJpCtvxAk+k8i/ZllbqK6OmKVdAcEno6biLGvFfFIBF+I4WupecVJam6B0G6Kb51q4BeHFAmlWgCBgI9CNKaNquTrAYjcpD5MnGuColK+ID+52b+jHjEeq0G+PxKNsg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YEDKF18T; 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="YEDKF18T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E390AC4CEE2; Wed, 23 Apr 2025 14:54:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745420076; bh=HkK9F02ZSU2e2MfaqlbpJJ3BGpv92mF0EvJeMXjuAXs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YEDKF18TuMWYa/XYenqBOlUkotBmvuCK4UksPRtUb23wXKMVninv5PmdLAty9Yfh2 tixw07KIVXWsGmqmC/wwSmT/Kz3wqTV0hQENrZhcoEXixhv382d9HzXlI0ovT+3qux jn8ovDAFpv/zEb9pDcSjG0nhDIDedAvI0i+X4468= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yong Wu , AngeloGioacchino Del Regno , Louis-Alexis Eyraud , Joerg Roedel , Sasha Levin , Chen-Yu Tsai Subject: [PATCH 6.6 036/393] iommu/mediatek: Fix NULL pointer deference in mtk_iommu_device_group Date: Wed, 23 Apr 2025 16:38:52 +0200 Message-ID: <20250423142644.781164196@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250423142643.246005366@linuxfoundation.org> References: <20250423142643.246005366@linuxfoundation.org> User-Agent: quilt/0.68 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: Louis-Alexis Eyraud [ Upstream commit 38e8844005e6068f336a3ad45451a562a0040ca1 ] Currently, mtk_iommu calls during probe iommu_device_register before the hw_list from driver data is initialized. Since iommu probing issue fix, it leads to NULL pointer dereference in mtk_iommu_device_group when hw_list is accessed with list_first_entry (not null safe). So, change the call order to ensure iommu_device_register is called after the driver data are initialized. Fixes: 9e3a2a643653 ("iommu/mediatek: Adapt sharing and non-sharing pgtable case") Fixes: bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe path") Reviewed-by: Yong Wu Tested-by: Chen-Yu Tsai # MT8183 Juniper, MT8186 Tentacruel Reviewed-by: AngeloGioacchino Del Regno Tested-by: AngeloGioacchino Del Regno Signed-off-by: Louis-Alexis Eyraud Link: https://lore.kernel.org/r/20250403-fix-mtk-iommu-error-v2-1-fe8b18f8b0a8@collabora.com Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/mtk_iommu.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index de698463e94ad..06c0770ff894e 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1354,15 +1354,6 @@ static int mtk_iommu_probe(struct platform_device *pdev) platform_set_drvdata(pdev, data); mutex_init(&data->mutex); - ret = iommu_device_sysfs_add(&data->iommu, dev, NULL, - "mtk-iommu.%pa", &ioaddr); - if (ret) - goto out_link_remove; - - ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev); - if (ret) - goto out_sysfs_remove; - if (MTK_IOMMU_HAS_FLAG(data->plat_data, SHARE_PGTABLE)) { list_add_tail(&data->list, data->plat_data->hw_list); data->hw_list = data->plat_data->hw_list; @@ -1372,19 +1363,28 @@ static int mtk_iommu_probe(struct platform_device *pdev) data->hw_list = &data->hw_list_head; } + ret = iommu_device_sysfs_add(&data->iommu, dev, NULL, + "mtk-iommu.%pa", &ioaddr); + if (ret) + goto out_list_del; + + ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev); + if (ret) + goto out_sysfs_remove; + if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) { ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match); if (ret) - goto out_list_del; + goto out_device_unregister; } return ret; -out_list_del: - list_del(&data->list); +out_device_unregister: iommu_device_unregister(&data->iommu); out_sysfs_remove: iommu_device_sysfs_remove(&data->iommu); -out_link_remove: +out_list_del: + list_del(&data->list); if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) device_link_remove(data->smicomm_dev, dev); out_runtime_disable: -- 2.39.5