kernel32: Improve parameter validation for ReadConsoleOutputCharacterW.

dlls/kernel32/console.c

@@ -862,6 +862,14 @@ BOOL WINAPI ReadConsoleOutputCharacterW( HANDLE hConsoleOutput, LPWSTR buffer, D
 
     TRACE( "(%p,%p,%d,%dx%d,%p)\n", hConsoleOutput, buffer, count, coord.X, coord.Y, read_count );
 
+    if (!read_count)
+    {
+        SetLastError(ERROR_INVALID_ACCESS);
+        return FALSE;
+    }
+
+    *read_count = 0;
+
     SERVER_START_REQ( read_console_output )
     {
         req->handle = console_handle_unmap(hConsoleOutput);
@@ -871,9 +879,7 @@ BOOL WINAPI ReadConsoleOutputCharacterW( HANDLE hConsoleOutput, LPWSTR buffer, D
         req->wrap   = TRUE;
         wine_server_set_reply( req, buffer, count * sizeof(WCHAR) );
         if ((ret = !wine_server_call_err( req )))
-        {
-            if (read_count) *read_count = wine_server_reply_size(reply) / sizeof(WCHAR);
-        }
+            *read_count = wine_server_reply_size(reply) / sizeof(WCHAR);
     }
     SERVER_END_REQ;
     return ret;

dlls/kernel32/tests/console.c

@@ -1855,6 +1855,90 @@ static void test_FillConsoleOutputAttribute(HANDLE output_handle)
     ok(count == 1, "Expected count to be 1, got %u\n", count);
 }
 
+static void test_ReadConsoleOutputCharacterW(HANDLE output_handle)
+{
+    WCHAR read;
+    COORD origin = {0, 0};
+    DWORD count;
+    BOOL ret;
+    int i;
+
+    const struct
+    {
+        HANDLE hConsoleOutput;
+        LPWSTR buffer;
+        DWORD length;
+        COORD coord;
+        LPDWORD read_count;
+        DWORD expected_count;
+        DWORD last_error;
+        int win7_crash;
+    } invalid_table[] =
+    {
+        {NULL, NULL, 0, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {NULL, NULL, 0, origin, &count, 0, ERROR_INVALID_HANDLE},
+        {NULL, NULL, 1, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {NULL, NULL, 1, origin, &count, 0, ERROR_INVALID_HANDLE, 1},
+        {NULL, &read, 0, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {NULL, &read, 0, origin, &count, 0, ERROR_INVALID_HANDLE},
+        {NULL, &read, 1, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {NULL, &read, 1, origin, &count, 0, ERROR_INVALID_HANDLE},
+        {INVALID_HANDLE_VALUE, NULL, 0, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {INVALID_HANDLE_VALUE, NULL, 0, origin, &count, 0, ERROR_INVALID_HANDLE},
+        {INVALID_HANDLE_VALUE, NULL, 1, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {INVALID_HANDLE_VALUE, NULL, 1, origin, &count, 0, ERROR_INVALID_HANDLE, 1},
+        {INVALID_HANDLE_VALUE, &read, 0, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {INVALID_HANDLE_VALUE, &read, 0, origin, &count, 0, ERROR_INVALID_HANDLE},
+        {INVALID_HANDLE_VALUE, &read, 1, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {INVALID_HANDLE_VALUE, &read, 1, origin, &count, 0, ERROR_INVALID_HANDLE},
+        {output_handle, NULL, 0, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {output_handle, NULL, 1, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {output_handle, NULL, 1, origin, &count, 1, ERROR_INVALID_ACCESS, 1},
+        {output_handle, NULL, 10, origin, &count, 10, ERROR_INVALID_ACCESS, 1},
+        {output_handle, &read, 0, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+        {output_handle, &read, 1, origin, NULL, 0xdeadbeef, ERROR_INVALID_ACCESS, 1},
+    };
+
+    for (i = 0; i < sizeof(invalid_table)/sizeof(invalid_table[0]); i++)
+    {
+        if (invalid_table[i].win7_crash)
+            continue;
+
+        SetLastError(0xdeadbeef);
+        if (invalid_table[i].read_count) count = 0xdeadbeef;
+        ret = ReadConsoleOutputCharacterW(invalid_table[i].hConsoleOutput,
+                                          invalid_table[i].buffer,
+                                          invalid_table[i].length,
+                                          invalid_table[i].coord,
+                                          invalid_table[i].read_count);
+        ok(!ret, "[%d] Expected ReadConsoleOutputCharacterW to return FALSE, got %d\n", i, ret);
+        if (invalid_table[i].read_count)
+        {
+            ok(count == invalid_table[i].expected_count,
+               "[%d] Expected count to be %u, got %u\n",
+               i, invalid_table[i].expected_count, count);
+        }
+        ok(GetLastError() == invalid_table[i].last_error,
+           "[%d] Expected last error to be %u, got %u\n",
+           i, invalid_table[i].last_error, GetLastError());
+    }
+
+    count = 0xdeadbeef;
+    ret = ReadConsoleOutputCharacterW(output_handle, NULL, 0, origin, &count);
+    ok(ret == TRUE, "Expected ReadConsoleOutputCharacterW to return TRUE, got %d\n", ret);
+    ok(count == 0, "Expected count to be 0, got %u\n", count);
+
+    count = 0xdeadbeef;
+    ret = ReadConsoleOutputCharacterW(output_handle, &read, 0, origin, &count);
+    ok(ret == TRUE, "Expected ReadConsoleOutputCharacterW to return TRUE, got %d\n", ret);
+    ok(count == 0, "Expected count to be 0, got %u\n", count);
+
+    count = 0xdeadbeef;
+    ret = ReadConsoleOutputCharacterW(output_handle, &read, 1, origin, &count);
+    ok(ret == TRUE, "Expected ReadConsoleOutputCharacterW to return TRUE, got %d\n", ret);
+    ok(count == 1, "Expected count to be 1, got %u\n", count);
+}
+
 START_TEST(console)
 {
     static const char font_name[] = "Lucida Console";
@@ -1969,4 +2053,5 @@ START_TEST(console)
     test_FillConsoleOutputCharacterA(hConOut);
     test_FillConsoleOutputCharacterW(hConOut);
     test_FillConsoleOutputAttribute(hConOut);
+    test_ReadConsoleOutputCharacterW(hConOut);
 }