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author | Fenghua Yu <fenghua.yu@intel.com> | 2009-04-06 18:21:49 (GMT) |
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committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-04-06 21:47:00 (GMT) |
commit | 31d3568dfeb1dfb2735f119efe5ece7c6d40969c (patch) | |
tree | 1318855f27727682e4ceda925c499ae99d6f4bba /firmware | |
parent | ffa009c366e33f3eae48bba2547051fe15795f64 (diff) | |
download | linux-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>
Diffstat (limited to 'firmware')
0 files changed, 0 insertions, 0 deletions