commit 85a778c0e45e87e35ee7199f1f25020648e8b812
Author: newsoft <newsoft@MacBook-Air-de-newsoft-2.local>
Date:   Fri Aug 15 16:41:58 2014 +0200

    Check for MallocFrameBuffer() return value
    
    If MallocFrameBuffer() returns FALSE, frame buffer pointer is left to
    NULL. Subsequent writes into that buffer could lead to memory
    corruption, or even arbitrary code execution.

diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index b4d7156..f55c74f 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -1829,7 +1829,8 @@ HandleRFBServerMessage(rfbClient* client)
 	client->updateRect.x = client->updateRect.y = 0;
 	client->updateRect.w = client->width;
 	client->updateRect.h = client->height;
-	client->MallocFrameBuffer(client);
+  if (!client->MallocFrameBuffer(client))
+    return FALSE;
 	SendFramebufferUpdateRequest(client, 0, 0, rect.r.w, rect.r.h, FALSE);
 	rfbClientLog("Got new framebuffer size: %dx%d\n", rect.r.w, rect.r.h);
 	continue;
@@ -2290,7 +2291,9 @@ HandleRFBServerMessage(rfbClient* client)
     client->updateRect.x = client->updateRect.y = 0;
     client->updateRect.w = client->width;
     client->updateRect.h = client->height;
-    client->MallocFrameBuffer(client);
+    if (!client->MallocFrameBuffer(client))
+      return FALSE;
+
     SendFramebufferUpdateRequest(client, 0, 0, client->width, client->height, FALSE);
     rfbClientLog("Got new framebuffer size: %dx%d\n", client->width, client->height);
     break;
@@ -2306,7 +2309,8 @@ HandleRFBServerMessage(rfbClient* client)
     client->updateRect.x = client->updateRect.y = 0;
     client->updateRect.w = client->width;
     client->updateRect.h = client->height;
-    client->MallocFrameBuffer(client);
+    if (!client->MallocFrameBuffer(client))
+      return FALSE;
     SendFramebufferUpdateRequest(client, 0, 0, client->width, client->height, FALSE);
     rfbClientLog("Got new framebuffer size: %dx%d\n", client->width, client->height);
     break;
diff --git a/libvncclient/vncviewer.c b/libvncclient/vncviewer.c
index 24bc6f8..65b7412 100644
--- a/libvncclient/vncviewer.c
+++ b/libvncclient/vncviewer.c
@@ -250,7 +250,8 @@ static rfbBool rfbInitConnection(rfbClient* client)
 
   client->width=client->si.framebufferWidth;
   client->height=client->si.framebufferHeight;
-  client->MallocFrameBuffer(client);
+  if (!client->MallocFrameBuffer(client))
+    return FALSE;
 
   if (!SetFormatAndEncodings(client))
     return FALSE;