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[NTOS:CC] Don't read past the end of the file in CcPerformReadAhead.

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Thomas Faber 2018-02-20 13:49:54 +01:00
parent 56e2bf2f92
commit a2f77ee3fb
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10
ntoskrnl/cc/copy.c
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@ -517,6 +517,16 @@ CcPerformReadAhead(
/* Remember it's locked */ /* Remember it's locked */
Locked = TRUE; Locked = TRUE;
/* Don't read past the end of the file */
if (CurrentOffset >= SharedCacheMap->FileSize.QuadPart)
{
goto Clear;
}
if (CurrentOffset + Length > SharedCacheMap->FileSize.QuadPart)
{
Length = SharedCacheMap->FileSize.QuadPart - CurrentOffset;
}
/* Next of the algorithm will lock like CcCopyData with the slight /* Next of the algorithm will lock like CcCopyData with the slight
* difference that we don't copy data back to an user-backed buffer * difference that we don't copy data back to an user-backed buffer
* We just bring data into Cc * We just bring data into Cc