d3dx9: Handle invalid byte code in D3DXFindShaderComment().

dlls/d3dx9_36/shader.c

@@ -40,6 +40,11 @@ HRESULT WINAPI D3DAssemble(LPCVOID data, SIZE_T datasize, LPCSTR filename,
                            UINT flags,
                            ID3DBlob **shader, ID3DBlob **error_messages);
 
+static inline BOOL is_valid_bytecode(DWORD token)
+{
+    return (token & 0xfffe0000) == 0xfffe0000;
+}
+
 const char * WINAPI D3DXGetPixelShaderProfile(struct IDirect3DDevice9 *device)
 {
     D3DCAPS9 caps;
@@ -147,17 +152,17 @@ const char * WINAPI D3DXGetVertexShaderProfile(struct IDirect3DDevice9 *device)
     return NULL;
 }
 
-HRESULT WINAPI D3DXFindShaderComment(CONST DWORD* byte_code, DWORD fourcc, LPCVOID* data, UINT* size)
+HRESULT WINAPI D3DXFindShaderComment(const DWORD *byte_code, DWORD fourcc, const void **data, UINT *size)
 {
-    CONST DWORD *ptr = byte_code;
+    const DWORD *ptr = byte_code;
 
-    TRACE("(%p, %x, %p, %p)\n", byte_code, fourcc, data, size);
+    TRACE("byte_code %p, fourcc %x, data %p, size %p\n", byte_code, fourcc, data, size);
 
     if (data) *data = NULL;
     if (size) *size = 0;
 
-    if (!byte_code)
-        return D3DERR_INVALIDCALL;
+    if (!byte_code) return D3DERR_INVALIDCALL;
+    if (!is_valid_bytecode(*byte_code)) return D3DXERR_INVALIDDATA;
 
     while (*++ptr != D3DSIO_END)
     {

dlls/d3dx9_36/tests/shader.c

@@ -20,6 +20,12 @@
 #include "wine/test.h"
 #include "d3dx9.h"
 
+static const DWORD shader_zero[] = {0x0};
+
+static const DWORD shader_invalid[] = {0xeeee0100};
+
+static const DWORD shader_empty[] = {0xfffeffff, 0x0000ffff};
+
 static const DWORD simple_vs[] = {
     0xfffe0101,                                                             /* vs_1_1                       */
     0x0000001f, 0x80000000, 0x900f0000,                                     /* dcl_position0 v0             */
@@ -330,6 +336,21 @@ static void test_find_shader_comment(void)
     ok(hr == D3D_OK, "Got result %x, expected 0 (D3D_OK)\n", hr);
     ok(data == (LPCVOID)(shader_with_ctab + 6), "Got result %p, expected %p\n", data, shader_with_ctab + 6);
     ok(size == 28, "Got result %d, expected 28\n", size);
+
+    hr = D3DXFindShaderComment(shader_zero, MAKEFOURCC('C','T','A','B'), &data, &size);
+    ok(hr == D3DXERR_INVALIDDATA, "Got result %x, expected %x (D3DXERR_INVALIDDATA)\n", hr, D3DXERR_INVALIDDATA);
+    ok(!data, "Got %p, expected NULL\n", data);
+    ok(!size, "Got %u, expected 0\n", size);
+
+    hr = D3DXFindShaderComment(shader_invalid, MAKEFOURCC('C','T','A','B'), &data, &size);
+    ok(hr == D3DXERR_INVALIDDATA, "Got result %x, expected %x (D3DXERR_INVALIDDATA)\n", hr, D3DXERR_INVALIDDATA);
+    ok(!data, "Got %p, expected NULL\n", data);
+    ok(!size, "Got %u, expected 0\n", size);
+
+    hr = D3DXFindShaderComment(shader_empty, MAKEFOURCC('C','T','A','B'), &data, &size);
+    ok(hr == S_FALSE, "Got result %x, expected %x (S_FALSE)\n", hr, S_FALSE);
+    ok(!data, "Got %p, expected NULL\n", data);
+    ok(!size, "Got %u, expected 0\n", size);
 }
 
 static void test_get_shader_constant_table_ex(void)