[PATCH spice-server 1/2] red-stream-device: Fix and check empty data messages

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

If guest sent an empty data message this was not parsed correctly.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/red-stream-device.c        |  2 +-
 server/tests/test-stream-device.c | 18 +++++++++++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/server/red-stream-device.c b/server/red-stream-device.c
index 6a2b6a73a..77d0acd06 100644
--- a/server/red-stream-device.c
+++ b/server/red-stream-device.c
@@ -332,7 +332,7 @@ handle_msg_data(StreamDevice *dev, SpiceCharDeviceInstance *sin)
     /* read from device */
     n = sif->read(sin, dev->msg->buf + dev->msg_pos, dev->hdr.size - dev->msg_pos);
     if (n <= 0) {
-        return false;
+        return dev->msg_pos == dev->hdr.size;
     }
 
     dev->msg_pos += n;
diff --git a/server/tests/test-stream-device.c b/server/tests/test-stream-device.c
index 00fbc90c7..ae9a78da5 100644
--- a/server/tests/test-stream-device.c
+++ b/server/tests/test-stream-device.c
@@ -352,8 +352,8 @@ static void test_stream_device_format_after_data(void)
     basic_event_loop_destroy();
 }
 
-// check empty capabilities
-static void test_stream_device_empty_capabilities(void)
+// check empty message
+static void test_stream_device_empty(StreamMsgType msg_type)
 {
     uint8_t *p = message;
     SpiceCoreInterface *core = basic_event_loop_init();
@@ -365,7 +365,7 @@ static void test_stream_device_empty_capabilities(void)
     message_sizes_end = message_sizes;
 
     // add some messages into device buffer
-    p = add_stream_hdr(p, STREAM_TYPE_CAPABILITIES, 0);
+    p = add_stream_hdr(p, msg_type, 0);
     *message_sizes_end = p - message;
     ++message_sizes_end;
     p = add_format(p, 640, 480, SPICE_VIDEO_CODEC_TYPE_MJPEG);
@@ -396,6 +396,17 @@ static void test_stream_device_empty_capabilities(void)
     basic_event_loop_destroy();
 }
 
+// check empty capabilities
+static void test_stream_device_empty_capabilities(void)
+{
+    test_stream_device_empty(STREAM_TYPE_CAPABILITIES);
+}
+
+// check empty data
+static void test_stream_device_empty_data(void)
+{
+    test_stream_device_empty(STREAM_TYPE_DATA);
+}
 
 int main(int argc, char *argv[])
 {
@@ -406,6 +417,7 @@ int main(int argc, char *argv[])
     g_test_add_func("/server/stream-device-multiple", test_stream_device_multiple);
     g_test_add_func("/server/stream-device-format-after-data", test_stream_device_format_after_data);
     g_test_add_func("/server/stream-device-empty-capabilities", test_stream_device_empty_capabilities);
+    g_test_add_func("/server/stream-device-empty-data", test_stream_device_empty_data);
 
     return g_test_run();
 }
-- 
2.17.1

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