From: Yang Yingliang <yangyingliang@xxxxxxxxxx>
[ Upstream commit 73b6924cdebc899de9b719e1319aa86c6bed4acf ]
platform_get_resource() may return NULL pointer, we need check its
return value to avoid null-ptr-deref in resource_size().
Fixes: 42d57fc58aeb ("iommu/mediatek: Initialise/Remove for multi bank dev")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Link: https://lore.kernel.org/r/20221029103550.3774365-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/iommu/mtk_iommu.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 2ab2ecfe01f8..2d14dc846b83 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -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;
--
2.35.1
