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kernelbase: Don't allow converting thread to fiber more than once. 

Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Paul Gofman 2021-07-29 11:08:19 +03:00 committed by Alexandre Julliard
parent 15bc605224
commit 90d3b9a313
2 changed files with 20 additions and 0 deletions
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14
dlls/kernel32/tests/fiber.c
View File

@ -128,10 +128,17 @@ static VOID WINAPI FiberMainProc(LPVOID lpFiberParameter)
static void test_ConvertThreadToFiber(void)
{
void *ret;
if (pConvertThreadToFiber)
{
fibers[0] = pConvertThreadToFiber(&testparam);
ok(fibers[0] != NULL, "ConvertThreadToFiber failed with error %u\n", GetLastError());
SetLastError(0xdeadbeef);
ret = pConvertThreadToFiber(&testparam);
ok(!ret, "Got non NULL ret.\n");
ok(GetLastError() == ERROR_ALREADY_FIBER, "Got unexpected error %u.\n", GetLastError());
}
else
{
@ -141,10 +148,17 @@ static void test_ConvertThreadToFiber(void)
static void test_ConvertThreadToFiberEx(void)
{
void *ret;
if (pConvertThreadToFiberEx)
{
fibers[0] = pConvertThreadToFiberEx(&testparam, 0);
ok(fibers[0] != NULL, "ConvertThreadToFiberEx failed with error %u\n", GetLastError());
SetLastError(0xdeadbeef);
ret = pConvertThreadToFiberEx(&testparam, 0);
ok(!ret, "Got non NULL ret.\n");
ok(GetLastError() == ERROR_ALREADY_FIBER, "Got unexpected error %u.\n", GetLastError());
}
else
{

6
dlls/kernelbase/thread.c
View File

@ -990,6 +990,12 @@ LPVOID WINAPI DECLSPEC_HOTPATCH ConvertThreadToFiberEx( LPVOID param, DWORD flag
{
struct fiber_data *fiber;
if (NtCurrentTeb()->Tib.u.FiberData)
{
SetLastError( ERROR_ALREADY_FIBER );
return NULL;
}
if (!(fiber = HeapAlloc( GetProcessHeap(), 0, sizeof(*fiber) )))
{
SetLastError( ERROR_NOT_ENOUGH_MEMORY );