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Red Hat Bugzilla – Attachment 312162 Details for
Bug 298811
pci_alloc_consistent() for 64k on 16gig machine -> return value is not multiple of 64k
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[patch]
Upstream patch that fixes an overflow bug
upstream.patch (text/plain), 888 bytes, created by
Prarit Bhargava
on 2008-07-18 17:59:25 UTC
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Description:
Upstream patch that fixes an overflow bug
Filename:
MIME Type:
Creator:
Prarit Bhargava
Created:
2008-07-18 17:59:25 UTC
Size:
888 bytes
patch
obsolete
>(This didn't appear on LKML or any of the mirrors ... trying again) > >It is possible that alloc_iommu()'s boundary_size overflows as >dma_get_seg_boundary can return 0xffffffff. In that case, further usage of >boundary_size triggers a BUG_ON() in the iommu code. > >Signed-off-by: Prarit Bhargava <prarit@redhat.com> > >diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c >index faf3229..baecb47 100644 >--- a/arch/x86/kernel/pci-gart_64.c >+++ b/arch/x86/kernel/pci-gart_64.c >@@ -91,7 +91,7 @@ static unsigned long alloc_iommu(struct device *dev, int size) > > base_index = ALIGN(iommu_bus_base & dma_get_seg_boundary(dev), > PAGE_SIZE) >> PAGE_SHIFT; >- boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, >+ boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1, > PAGE_SIZE) >> PAGE_SHIFT; > > spin_lock_irqsave(&iommu_bitmap_lock, flags);
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