iommu/vt-d: Fix overflow of iommu->domains array
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>
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@ -4607,7 +4607,7 @@ static void free_all_cpu_cached_iovas(unsigned int cpu)
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if (!iommu)
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continue;
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for (did = 0; did < 0xffff; did++) {
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for (did = 0; did < cap_ndoms(iommu->cap); did++) {
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domain = get_iommu_domain(iommu, did);
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if (!domain)
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