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[ntoskrnl]

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- Fix a crash in KiSystemCall that was caused because PsConvertToGuiThread may have switched to a large kernel stack, but still returned with failure because win32k did not succeed. To fix it reload the trap frame after the call before checking for success.

svn path=/trunk/; revision=55724
This commit is contained in:
Giannis Adamopoulos 2012-02-19 22:05:25 +00:00
parent d46e167a87
commit 850d4b4ddf
1 changed files with 6 additions and 5 deletions
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9
reactos/ntoskrnl/ke/i386/traphdlr.c
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@ -1556,6 +1556,11 @@ KiSystemCall(IN PKTRAP_FRAME TrapFrame,
/* Convert us to a GUI thread -- must wrap in ASM to get new EBP */
Result = KiConvertToGuiThread();
/* Reload trap frame and descriptor table pointer from new stack */
TrapFrame = *(volatile PVOID*)&Thread->TrapFrame;
DescriptorTable = (PVOID)(*(volatile ULONG_PTR*)&Thread->ServiceTable + Offset);
if (!NT_SUCCESS(Result))
{
/* Set the last error and fail */
@ -1563,10 +1568,6 @@ KiSystemCall(IN PKTRAP_FRAME TrapFrame,
goto ExitCall;
}
/* Reload trap frame and descriptor table pointer from new stack */
TrapFrame = *(volatile PVOID*)&Thread->TrapFrame;
DescriptorTable = (PVOID)(*(volatile ULONG_PTR*)&Thread->ServiceTable + Offset);
/* Validate the system call number again */
if (Id >= DescriptorTable->Limit)
{