Fix #4868: Allow empty bands data.

libfreerdp/codec/clear.c

@@ -634,7 +634,6 @@ static BOOL clear_decompress_bands_data(CLEAR_CONTEXT* clear,
 		UINT16 yEnd;
 		UINT32 colorBkg;
 		UINT16 vBarHeader;
-		UINT16 vBarIndex;
 		UINT16 vBarYOn;
 		UINT16 vBarYOff;
 		UINT32 vBarCount;
@@ -697,7 +696,7 @@ static BOOL clear_decompress_bands_data(CLEAR_CONTEXT* clear,
 
 			if ((vBarHeader & 0xC000) == 0x4000) /* SHORT_VBAR_CACHE_HIT */
 			{
-				vBarIndex = (vBarHeader & 0x3FFF);
+				const UINT16 vBarIndex = (vBarHeader & 0x3FFF);
 				vBarShortEntry = &(clear->ShortVBarStorage[vBarIndex]);
 
 				if (!vBarShortEntry)
@@ -779,8 +778,18 @@ static BOOL clear_decompress_bands_data(CLEAR_CONTEXT* clear,
 			}
 			else if ((vBarHeader & 0x8000) == 0x8000) /* VBAR_CACHE_HIT */
 			{
-				vBarIndex = (vBarHeader & 0x7FFF);
+				const UINT16 vBarIndex = (vBarHeader & 0x7FFF);
 				vBarEntry = &(clear->VBarStorage[vBarIndex]);
+
+				/* If the cache was reset we need to fill in some dummy data. */
+				if (vBarEntry->size == 0)
+				{
+					WLog_WARN(TAG, "Empty cache index %"PRIu16", filling dummy data", vBarIndex);
+					vBarEntry->count = vBarHeight;
+
+					if (!resize_vbar_entry(clear, vBarEntry))
+						return FALSE;
+				}
 			}
 			else
 			{

libfreerdp/core/connection.c

@@ -169,6 +169,24 @@
 
 static int rdp_client_connect_finalize(rdpRdp* rdp);
 
+
+static BOOL rdp_client_reset_codecs(rdpContext* context)
+{
+	rdpSettings* settings;
+
+	if (!context || !context->settings)
+		return FALSE;
+
+	settings = context->settings;
+	context->codecs = codecs_new(context);
+
+	if (!context->codecs)
+		return FALSE;
+
+	return freerdp_client_codecs_prepare(context->codecs, FREERDP_CODEC_ALL,
+	                                     settings->DesktopWidth, settings->DesktopHeight);
+}
+
 /**
  * Establish RDP Connection based on the settings given in the 'rdp' parameter.
  * @msdn{cc240452}
@@ -183,6 +201,9 @@ BOOL rdp_client_connect(rdpRdp* rdp)
 	/* make sure SSL is initialize for earlier enough for crypto, by taking advantage of winpr SSL FIPS flag for openssl initialization */
 	DWORD flags = WINPR_SSL_INIT_DEFAULT;
 
+	if (!rdp_client_reset_codecs(rdp->context))
+		return FALSE;
+
 	if (settings->FIPSMode)
 		flags |= WINPR_SSL_INIT_ENABLE_FIPS;
 
@@ -336,6 +357,7 @@ BOOL rdp_client_disconnect(rdpRdp* rdp)
 	if (freerdp_channels_disconnect(context->channels, context->instance) != CHANNEL_RC_OK)
 		return FALSE;
 
+	codecs_free(context->codecs);
 	return TRUE;
 }
 

libfreerdp/core/freerdp.c

@@ -165,7 +165,6 @@ BOOL freerdp_connect(freerdp* instance)
 	ResetEvent(instance->context->abortEvent);
 	rdp = instance->context->rdp;
 	settings = instance->settings;
-	instance->context->codecs = codecs_new(instance->context);
 	IFCALLRET(instance->PreConnect, status, instance);
 	instance->ConnectionCallbackState = CLIENT_STATE_PRECONNECT_PASSED;
 
@@ -525,7 +524,6 @@ BOOL freerdp_disconnect(freerdp* instance)
 		instance->update->pcap_rfx = NULL;
 	}
 
-	codecs_free(instance->context->codecs);
 	freerdp_channels_close(instance->context->channels, instance);
 	return rc;
 }

libfreerdp/gdi/gdi.c

@@ -1024,7 +1024,8 @@ static BOOL gdi_surface_bits(rdpContext* context,
 	           "destLeft %"PRIu32" destTop %"PRIu32" destRight %"PRIu32" destBottom %"PRIu32" "
 	           "bpp %"PRIu8" flags %"PRIx8" codecID %"PRIu16" width %"PRIu16" height %"PRIu16" length %"PRIu32"",
 	           cmd->destLeft, cmd->destTop, cmd->destRight, cmd->destBottom,
-			   cmd->bmp.bpp, cmd->bmp.flags, cmd->bmp.codecID, cmd->bmp.width, cmd->bmp.height, cmd->bmp.bitmapDataLength);
+	           cmd->bmp.bpp, cmd->bmp.flags, cmd->bmp.codecID, cmd->bmp.width, cmd->bmp.height,
+	           cmd->bmp.bitmapDataLength);
 	region16_init(&region);
 	cmdRect.left = cmd->destLeft;
 	cmdRect.top = cmd->destTop;
@@ -1287,10 +1288,6 @@ BOOL gdi_init_ex(freerdp* instance, UINT32 format, UINT32 stride, BYTE* buffer,
 	if (!(context->cache = cache_new(instance->settings)))
 		goto fail;
 
-	if (!freerdp_client_codecs_prepare(context->codecs, FREERDP_CODEC_ALL,
-	                                   gdi->width, gdi->height))
-		goto fail;
-
 	gdi_register_update_callbacks(instance->update);
 	brush_cache_register_callbacks(instance->update);
 	glyph_cache_register_callbacks(instance->update);