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iommu: sprd: Avoid NULL deref in sprd_iommu_hw_en

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[ Upstream commit 630482ee06 ]

In sprd_iommu_cleanup() before calling function sprd_iommu_hw_en()
dom->sdev is equal to NULL, which leads to null dereference.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 9afea57384 ("iommu/sprd: Release dma buffer to avoid memory leak")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
Reviewed-by: Chunyan Zhang <zhang.lyra@gmail.com>
Link: https://lore.kernel.org/r/20240716125522.3690358-1-artem.chernyshev@red-soft.ru
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Artem Chernyshev
2024-07-16 15:55:14 +03:00
committed by Greg Kroah-Hartman
parent f82bc4a04a
commit dfe90030a0
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/sprd-iommu.c
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@ -234,8 +234,8 @@ static void sprd_iommu_cleanup(struct sprd_iommu_domain *dom)
pgt_size = sprd_iommu_pgt_size(&dom->domain); pgt_size = sprd_iommu_pgt_size(&dom->domain);
dma_free_coherent(dom->sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa); dma_free_coherent(dom->sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa);
dom->sdev = NULL;
sprd_iommu_hw_en(dom->sdev, false); sprd_iommu_hw_en(dom->sdev, false);
dom->sdev = NULL;
} }
static void sprd_iommu_domain_free(struct iommu_domain *domain) static void sprd_iommu_domain_free(struct iommu_domain *domain)