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Message-ID: <f3c1c76c-ef61-ab68-e6db-ebcf408d42d6@gmail.com>
Date: Tue, 22 Nov 2022 17:43:45 +0100
From: Matthias Brugger <matthias.bgg@...il.com>
To: Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
Will Deacon <will@...nel.org>
Cc: Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
mingyuan.ma@...iatek.com, yf.wang@...iatek.com,
libo.kang@...iatek.com, chengci.xu@...iatek.com,
youlin.pei@...iatek.com, anan.sun@...iatek.com,
xueqi.zhang@...iatek.com, Guenter Roeck <groeck@...omium.org>,
Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v7 4/6] iommu/mediatek: Validate number of phandles
associated with "mediatek,larbs"
On 18/10/2022 04:42, Yong Wu wrote:
> From: Guenter Roeck <groeck@...omium.org>
>
> Fix the smatch warnings:
> drivers/iommu/mtk_iommu.c:878 mtk_iommu_mm_dts_parse() error: uninitialized
> symbol 'larbnode'.
>
> If someone abuse the dtsi node(Don't follow the definition of dt-binding),
> for example "mediatek,larbs" is provided as boolean property, "larb_nr"
> will be zero and cause abnormal.
>
> To fix this problem and improve the code safety, add some checking
> for the invalid input from dtsi, e.g. checking the larb_nr/larbid valid
> range, and avoid "mediatek,larb-id" property conflicts in the smi-larb
> nodes.
>
> Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with the MM TYPE")
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Guenter Roeck <groeck@...omium.org>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> ---
> drivers/iommu/mtk_iommu.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 912322494bc0..9cbff48f03c0 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -1050,6 +1050,8 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
> larb_nr = of_count_phandle_with_args(dev->of_node, "mediatek,larbs", NULL);
> if (larb_nr < 0)
> return larb_nr;
> + if (larb_nr == 0 || larb_nr > MTK_LARB_NR_MAX)
> + return -EINVAL;
>
> for (i = 0; i < larb_nr; i++) {
> u32 id;
> @@ -1068,6 +1070,11 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
> ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id);
> if (ret)/* The id is consecutive if there is no this property */
> id = i;
> + if (id >= MTK_LARB_NR_MAX) {
> + of_node_put(larbnode);
> + ret = -EINVAL;
> + goto err_larbdev_put;
> + }
>
> plarbdev = of_find_device_by_node(larbnode);
> of_node_put(larbnode);
> @@ -1075,6 +1082,11 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
> ret = -ENODEV;
> goto err_larbdev_put;
> }
> + if (data->larb_imu[id].dev) {
> + platform_device_put(plarbdev);
> + ret = -EEXIST;
> + goto err_larbdev_put;
> + }
> data->larb_imu[id].dev = &plarbdev->dev;
>
> if (!plarbdev->dev.driver) {
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