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[RTL]

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Fix a mistake in RtlNumberOfSetBits, check for index out of range in RtlFindNextForwardRun*

svn path=/trunk/; revision=56794
This commit is contained in:
Timo Kreuzer 2012-06-24 13:39:32 +00:00
parent b6b380a67b
commit d58e76d5dc
1 changed files with 15 additions and 1 deletions
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16
reactos/lib/rtl/bitmap.c
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@ -421,7 +421,7 @@ RtlNumberOfSetBits(
}
Shift = 8 - (BitMapHeader->SizeOfBitMap & 7);
BitCount += BitCountTable[(*Byte) << Shift];
BitCount += BitCountTable[((*Byte) << Shift) & 0xFF];
return BitCount;
}
@ -618,6 +618,13 @@ RtlFindNextForwardRunClear(
{
ULONG Length;
/* Check for buffer overrun */
if (FromIndex >= BitMapHeader->SizeOfBitMap)
{
*StartingRunIndex = FromIndex;
return 0;
}
/* Assume a set run first, count it's length */
Length = RtlpGetLengthOfRunSet(BitMapHeader, FromIndex, MAXULONG);
*StartingRunIndex = FromIndex + Length;
@ -635,6 +642,13 @@ RtlFindNextForwardRunSet(
{
ULONG Length;
/* Check for buffer overrun */
if (FromIndex >= BitMapHeader->SizeOfBitMap)
{
*StartingRunIndex = FromIndex;
return 0;
}
/* Assume a clear run first, count it's length */
Length = RtlpGetLengthOfRunClear(BitMapHeader, FromIndex, MAXULONG);
*StartingRunIndex = FromIndex + Length;