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msi: Protect communication with the custom action server with a critical section. 

Avoids a potential race whereby an asynchronous custom action receives the
wrong thread handle.

Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Hans Leidekker <hans@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Zebediah Figura 2018-08-16 10:34:38 -05:00 committed by Alexandre Julliard
parent 3a884c2ef7
commit 583edf7f59
1 changed files with 4 additions and 0 deletions
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4
dlls/msi/custom.c
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@ -683,6 +683,8 @@ static DWORD WINAPI custom_client_thread(void *arg)
pipe = info->package->custom_server_64_pipe;
}
EnterCriticalSection(&msi_custom_action_cs);
if (!WriteFile(pipe, &info->guid, sizeof(info->guid), &size, NULL) ||
size != sizeof(info->guid))
{
@ -695,6 +697,8 @@ static DWORD WINAPI custom_client_thread(void *arg)
return GetLastError();
}
LeaveCriticalSection(&msi_custom_action_cs);
if (DuplicateHandle(process, (HANDLE)(DWORD_PTR)thread64, GetCurrentProcess(),
&thread, 0, FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE))
{