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[NTOS:EX] Fix query of SystemLookasideInformation

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Prevents a failed ASSSERT
This commit is contained in:
Timo Kreuzer
2025-07-26 11:19:30 +03:00
parent b7066b9232
commit 3a0f9f2fa0
1 changed files with 8 additions and 8 deletions
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16
ntoskrnl/ex/sysinfo.c
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@@ -2120,7 +2120,7 @@ ExpCopyLookasideInformation(
/* Loop as long as we have lookaside lists and free array elements */
for (ListEntry = ListHead->Flink;
(ListEntry != ListHead) && (Remaining > 0);
ListEntry = ListEntry->Flink, Remaining--)
ListEntry = ListEntry->Flink, Info++, Remaining--)
{
LookasideList = CONTAINING_RECORD(ListEntry, GENERAL_LOOKASIDE, ListEntry);
@@ -2165,6 +2165,13 @@ QSI_DEF(SystemLookasideInformation)
KIRQL OldIrql;
NTSTATUS Status;
/* Calculate how many items we can store */
Remaining = MaxCount = Size / sizeof(SYSTEM_LOOKASIDE_INFORMATION);
if (Remaining == 0)
{
return STATUS_INFO_LENGTH_MISMATCH;
}
/* First we need to lock down the memory, since we are going to access it
at high IRQL */
PreviousMode = ExGetPreviousMode();
@@ -2180,13 +2187,6 @@ QSI_DEF(SystemLookasideInformation)
return Status;
}
/* Calculate how many items we can store */
Remaining = MaxCount = Size / sizeof(SYSTEM_LOOKASIDE_INFORMATION);
if (Remaining == 0)
{
goto Leave;
}
/* Copy info from pool lookaside lists */
ExpCopyLookasideInformation(&Info,
&Remaining,