[PATCH 4/6] winealsa: Limit Wow64 buffer allocations to 32-bit addresses.

[Huw Davies]

Signed-off-by: Huw Davies 
---
 dlls/winealsa.drv/alsa.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/dlls/winealsa.drv/alsa.c b/dlls/winealsa.drv/alsa.c
index 0e86185e441..272040f8047 100644
--- a/dlls/winealsa.drv/alsa.c
+++ b/dlls/winealsa.drv/alsa.c
@@ -766,6 +766,15 @@ static void silence_buffer(struct alsa_stream *stream, BYTE *buffer, UINT32 fram
         memset(buffer, 0, frames * stream->fmt->nBlockAlign);
 }

+static ULONG_PTR zero_bits(void)
+{
+#ifdef _WIN64
+    return !NtCurrentTeb()->WowTebOffset ? 0 : 0x7fffffff;
+#else
+    return 0;
+#endif
+}
+
 static NTSTATUS create_stream(void *args)
 {
     struct create_stream_params *params = args;
@@ -948,7 +957,7 @@ static NTSTATUS create_stream(void *args)
     stream->fmt = &fmtex->Format;

size = stream->bufsize_frames * params->fmt->nBlockAlign;
-    if(NtAllocateVirtualMemory(GetCurrentProcess(), (void **)&stream->local_buffer, 0, &size,
+    if(NtAllocateVirtualMemory(GetCurrentProcess(), (void **)&stream->local_buffer, zero_bits(), &size,
                                MEM_COMMIT, PAGE_READWRITE)){
         params->result = E_OUTOFMEMORY;
         goto exit;
@@ -1661,7 +1670,7 @@ static NTSTATUS get_render_buffer(void *args)
                 stream->tmp_buffer = NULL;
             }
             size = frames * stream->fmt->nBlockAlign;
-            if(NtAllocateVirtualMemory(GetCurrentProcess(), (void **)&stream->tmp_buffer, 0, &size,
+            if(NtAllocateVirtualMemory(GetCurrentProcess(), (void **)&stream->tmp_buffer, zero_bits(), &size,
                                        MEM_COMMIT, PAGE_READWRITE)){
                 stream->tmp_buffer_frames = 0;
                 return alsa_unlock_result(stream, &params->result, E_OUTOFMEMORY);
@@ -1764,7 +1773,7 @@ static NTSTATUS get_capture_buffer(void *args)
                 stream->tmp_buffer = NULL;
             }
             size = *frames * stream->fmt->nBlockAlign;
-            if(NtAllocateVirtualMemory(GetCurrentProcess(), (void **)&stream->tmp_buffer, 0, &size,
+            if(NtAllocateVirtualMemory(GetCurrentProcess(), (void **)&stream->tmp_buffer, zero_bits(), &size,
                                        MEM_COMMIT, PAGE_READWRITE)){
                 stream->tmp_buffer_frames = 0;
                 return alsa_unlock_result(stream, &params->result, E_OUTOFMEMORY);