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ArmPkg/Mmu: Fix potential page table memory leak 

During page entry attribute update, if there are table entries
between starting BlockEntry and LastBlockEntry, table entries will be
set as block entries and the allocated memory of the tables will be
leaked.

So instead, we break the inner loop when we find a table entry and run
outer loop again to step into the table by the same logic.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>

[ardb: move termination condition check inside the loop]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18425 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Heyi Guo 2015-09-09 13:37:50 +00:00 committed by abiesheuvel
parent edff645fe4
commit 8483681426
1 changed files with 7 additions and 0 deletions
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7
ArmPkg/Library/ArmLib/AArch64/AArch64Mmu.c
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@ -455,6 +455,13 @@ FillTranslationTable (
RegionStart += BlockEntrySize;
RemainingRegionLength -= BlockEntrySize;
BlockEntry++;
// Break the inner loop when next block is a table
// Rerun GetBlockEntryListFromAddress to avoid page table memory leak
if (TableLevel != 3 &&
(*BlockEntry & TT_TYPE_MASK) == TT_TYPE_TABLE_ENTRY) {
break;
}
} while ((RemainingRegionLength >= BlockEntrySize) && (BlockEntry <= LastBlockEntry));
} while (RemainingRegionLength != 0);