Messages in this thread | | | Subject | Re: [PATCH v4 3/6] iommu: add ARM short descriptor page table allocator. | From | Robin Murphy <> | Date | Fri, 9 Oct 2015 18:41:51 +0100 |
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On 09/10/15 16:57, Will Deacon wrote: > 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?
Isn't it just cf27ec930be9 again wearing different trousers? All I do is call iommu_unmap with the same total size that was mapped originally.
Robin.
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