iommu/arm-smmu: Limit 2-level strtab allocation for small SID sizes

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If the StreamIDs in a system can all be resolved by a single level-2
stream table (i.e. SIDSIZE < SPLIT), then we currently get our maths
wrong and allocate the largest strtab we support, thanks to unsigned
overflow in our calculation.

This patch fixes the issue by checking the SIDSIZE explicitly when
calculating the size of our first-level stream table.

Reported-by: Matt Evans <matt.evans@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Will Deacon 2015-07-16 17:50:12 +01:00

parent ec11d63c67

commit 28c8b4045b

1 changed files with 11 additions and 3 deletions

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drivers/iommu/arm-smmu-v3.c

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