Messages in this thread | | | Date | Fri, 9 Oct 2015 16:57:50 +0100 | From | Will Deacon <> | Subject | Re: [PATCH v4 3/6] iommu: add ARM short descriptor page table allocator. |
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On Tue, Sep 22, 2015 at 03:12:47PM +0100, Yong Wu wrote: > I would like to show you a problem I met, The recursion here may > lead to stack overflow while we test FHD video decode. > > From the log, I get the internal variable in the error case: the > "size" is 0x100000, the "iova" is 0xfea00000, but at that time the > "blk_size" is 0x1000 as it was the map of small-page. so it enter the > recursion here. > > After check the unmap flow, there is only a iommu_unmap in > __iommu_dma_unmap, and it won't check the physical address align in > iommu_unmap.
That sounds like a bug in __iommu_dma_unmap. Robin?
Will
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