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Date: Fri, 14 Jun 2019 07:46:02 +0200 From: Juergen Gross <jgross@...e.com> To: xen-devel@...ts.xenproject.org, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Cc: Juergen Gross <jgross@...e.com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Stefano Stabellini <sstabellini@...nel.org>, stable@...r.kernel.org Subject: [PATCH v3 1/3] xen/swiotlb: fix condition for calling xen_destroy_contiguous_region() The condition in xen_swiotlb_free_coherent() for deciding whether to call xen_destroy_contiguous_region() is wrong: in case the region to be freed is not contiguous calling xen_destroy_contiguous_region() is the wrong thing to do: it would result in inconsistent mappings of multiple PFNs to the same MFN. This will lead to various strange crashes or data corruption. Instead of calling xen_destroy_contiguous_region() in that case a warning should be issued as that situation should never occur. Cc: stable@...r.kernel.org Signed-off-by: Juergen Gross <jgross@...e.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com> Reviewed-by: Jan Beulich <jbeulich@...e.com> --- V2: always issue a warning in case xen_destroy_contiguous_region() isn't called (Jan Beulich) --- drivers/xen/swiotlb-xen.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index d53f3493a6b9..50fd7de54969 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -361,8 +361,8 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, /* Convert the size to actually allocated. */ size = 1UL << (order + XEN_PAGE_SHIFT); - if (((dev_addr + size - 1 <= dma_mask)) || - range_straddles_page_boundary(phys, size)) + if (!WARN_ON((dev_addr + size - 1 > dma_mask) || + range_straddles_page_boundary(phys, size))) xen_destroy_contiguous_region(phys, order); xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs); -- 2.16.4
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