iommu/io-pgtable-arm: Ensure we free the final level on teardown
When tearing down page tables, we return early for the final level since we know that we won't have any table pointers to follow. Unfortunately, this also means that we forget to free the final level, so we end up leaking memory. Fix the issue by always freeing the current level, but just don't bother to iterate over the ptes if we're at the final level. Cc: <stable@vger.kernel.org> Reported-by: Zhang Bo <zhangbo_a@xiaomi.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -404,17 +404,18 @@ static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
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arm_lpae_iopte *start, *end;
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unsigned long table_size;
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/* Only leaf entries at the last level */
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if (lvl == ARM_LPAE_MAX_LEVELS - 1)
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return;
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if (lvl == ARM_LPAE_START_LVL(data))
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table_size = data->pgd_size;
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else
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table_size = ARM_LPAE_GRANULE(data);
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start = ptep;
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end = (void *)ptep + table_size;
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/* Only leaf entries at the last level */
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if (lvl == ARM_LPAE_MAX_LEVELS - 1)
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end = ptep;
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else
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end = (void *)ptep + table_size;
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while (ptep != end) {
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arm_lpae_iopte pte = *ptep++;
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