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iommu/mediatek: Check return value after calling platform_get_resource()

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platform_get_resource() may return NULL pointer, we need check its
return value to avoid null-ptr-deref in resource_size().

Fixes: 42d57fc58a ("iommu/mediatek: Initialise/Remove for multi bank dev")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20221029103550.3774365-1-yangyingliang@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yang Yingliang 2022-10-29 18:35:50 +08:00 • committed by Joerg Roedel
parent 30a0b95b13
commit 73b6924cde
1 changed files with 2 additions and 0 deletions
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2
drivers/iommu/mtk_iommu.c
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@ -1173,6 +1173,8 @@ static int mtk_iommu_probe(struct platform_device *pdev)
banks_num = data->plat_data->banks_num;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
if (resource_size(res) < banks_num * MTK_IOMMU_BANK_SZ) {
dev_err(dev, "banknr %d. res %pR is not enough.\n", banks_num, res);
return -EINVAL;