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authorFenghua Yu <fenghua.yu@intel.com>2009-04-06 18:21:49 (GMT)
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-04-06 21:47:00 (GMT)
commit31d3568dfeb1dfb2735f119efe5ece7c6d40969c (patch)
tree1318855f27727682e4ceda925c499ae99d6f4bba /firmware/ositech
parentffa009c366e33f3eae48bba2547051fe15795f64 (diff)
downloadlinux-31d3568dfeb1dfb2735f119efe5ece7c6d40969c.tar.xz
Intel-IOMMU Alignment Issue in dma_pte_clear_range()
This issue was pointed out by Linus. In dma_pte_clear_range() in intel-iommu.c start = PAGE_ALIGN(start); end &= PAGE_MASK; npages = (end - start) / VTD_PAGE_SIZE; In partial page case, start could be bigger than end and npages will be negative. Currently the issue doesn't show up as a real bug in because start and end have been aligned to page boundary already by all callers. So the issue has been hidden. But it is dangerous programming practice. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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