This is a note to let you know that I've just added the patch titled iommu: Switch gather->end to the inclusive end to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-switch-gather-end-to-the-inclusive-end.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit d922b13eef1f97ab9df774c69c7cc3698a51989c Author: Yong Wu <yong.wu@xxxxxxxxxxxx> Date: Thu Jan 7 20:29:06 2021 +0800 iommu: Switch gather->end to the inclusive end [ 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@xxxxxxxxxxxx> Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx> Acked-by: Will Deacon <will@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210107122909.16317-5-yong.wu@xxxxxxxxxxxx Signed-off-by: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> 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 8ca7415d785d9..c70d6e79f5346 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2280,7 +2280,7 @@ 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 8e56cec532e71..bfe6ec329f8d5 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -444,7 +444,7 @@ 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 efa96263b81b3..d63d3e9cc7b67 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -170,7 +170,7 @@ 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 @@ -538,7 +538,7 @@ 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