From: Yong Wu yong.wu@mediatek.com
[ Upstream commit 862c3715de8f3e5350489240c951d697f04bd8c9 ]
Currently gather->end is "unsigned long" which may be overflow in arch32 in the corner case: 0xfff00000 + 0x100000(iova + size). Although it doesn't affect the size(end - start), it affects the checking "gather->end < end"
This patch changes this "end" to the real end address (end = start + size - 1). Correspondingly, update the length to "end - start + 1".
Fixes: a7d20dc19d9e ("iommu: Introduce struct iommu_iotlb_gather for batching TLB flushes") Signed-off-by: Yong Wu yong.wu@mediatek.com Reviewed-by: Robin Murphy robin.murphy@arm.com Acked-by: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20210107122909.16317-5-yong.wu@mediatek.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 +- drivers/iommu/mtk_iommu.c | 2 +- include/linux/iommu.h | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index e634bbe605730..7067b7c116260 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2267,7 +2267,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain, { struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- arm_smmu_tlb_inv_range(gather->start, gather->end - gather->start, + arm_smmu_tlb_inv_range(gather->start, gather->end - gather->start + 1, gather->pgsize, true, smmu_domain); }
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index c072cee532c20..19387d2bc4b4f 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -445,7 +445,7 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain, struct iommu_iotlb_gather *gather) { struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); - size_t length = gather->end - gather->start; + size_t length = gather->end - gather->start + 1;
if (gather->start == ULONG_MAX) return; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 9bbcfe3b0bb12..f11f5072af5dc 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -169,7 +169,7 @@ enum iommu_dev_features { * struct iommu_iotlb_gather - Range information for a pending IOTLB flush * * @start: IOVA representing the start of the range to be flushed - * @end: IOVA representing the end of the range to be flushed (exclusive) + * @end: IOVA representing the end of the range to be flushed (inclusive) * @pgsize: The interval at which to perform the flush * * This structure is intended to be updated by multiple calls to the @@ -536,7 +536,7 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain, struct iommu_iotlb_gather *gather, unsigned long iova, size_t size) { - unsigned long start = iova, end = start + size; + unsigned long start = iova, end = start + size - 1;
/* * If the new page is disjoint from the current range or is mapped at