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iommu/vt-d: Fix overflow of iommu->domains array

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The valid range of 'did' in get_iommu_domain(*iommu, did)
is 0..cap_ndoms(iommu->cap), so don't exceed that
range in free_all_cpu_cached_iovas().

The user-visible impact of the out-of-bounds access is the machine
hanging on suspend-to-ram. It is, in fact, a kernel panic, but due
to already suspended devices, that's often not visible to the user.

Fixes: 22e2f9fa63 ("iommu/vt-d: Use per-cpu IOVA caching")
Signed-off-by: Jan Niehusmann <jan@gondor.com>
Tested-By: Marius Vlad <marius.c.vlad@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jan Niehusmann 2016-06-06 14:20:11 +02:00 committed by Joerg Roedel
parent 583248e662
commit 3bd4f9112f
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/intel-iommu.c
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@ -4607,7 +4607,7 @@ static void free_all_cpu_cached_iovas(unsigned int cpu)
if (!iommu)
continue;
for (did = 0; did < 0xffff; did++) {
for (did = 0; did < cap_ndoms(iommu->cap); did++) {
domain = get_iommu_domain(iommu, did);
if (!domain)