Index: /trunk/src/VBox/Devices/Network/DrvNAT.cpp
===================================================================
--- /trunk/src/VBox/Devices/Network/DrvNAT.cpp	(revision 57849)
+++ /trunk/src/VBox/Devices/Network/DrvNAT.cpp	(revision 57850)
@@ -497,4 +497,5 @@
             Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
                  cbMin));
+            RTMemFree(pSgBuf);
             return VERR_INVALID_PARAMETER;
         }
@@ -518,4 +519,5 @@
             Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
                  pGso->cbHdrsTotal + pGso->cbMaxSeg));
+            RTMemFree(pSgBuf);
             return VERR_INVALID_PARAMETER;
         }