NetworkPkg: Check received packet size before use it.

[mirror_edk2.git] / NetworkPkg / DnsDxe / DnsImpl.c

diff --git a/NetworkPkg/DnsDxe/DnsImpl.c b/NetworkPkg/DnsDxe/DnsImpl.c
index 19184415e5c5d0e0e8d79dfe8f75338239ccd12b..4f10e17cf30ffca63646b355da0857c599dc176b 100644 (file)
--- a/NetworkPkg/DnsDxe/DnsImpl.c
+++ b/NetworkPkg/DnsDxe/DnsImpl.c
@@ -1615,6 +1615,10 @@ DnsOnPacketReceived (
   }\r
 \r
   ASSERT (Packet != NULL);\r
+\r
+  if (Packet->TotalSize <= sizeof (DNS_HEADER)) {\r
+    goto ON_EXIT;\r
+  }\r
   \r
   RcvString = NetbufGetByte (Packet, 0, NULL);\r
   ASSERT (RcvString != NULL);\r
@@ -1624,15 +1628,15 @@ DnsOnPacketReceived (
   //\r
   ParseDnsResponse (Instance, RcvString, &Completed);\r
 \r
-  ON_EXIT:\r
+ON_EXIT:\r
 \r
-    if (Packet != NULL) {\r
-      NetbufFree (Packet);\r
-    }\r
+  if (Packet != NULL) {\r
+    NetbufFree (Packet);\r
+  }\r
 \r
-    if (!Completed) {\r
-      UdpIoRecvDatagram (Instance->UdpIo, DnsOnPacketReceived, Instance, 0);\r
-    }\r
+  if (!Completed) {\r
+    UdpIoRecvDatagram (Instance->UdpIo, DnsOnPacketReceived, Instance, 0);\r
+  }\r
 }\r
 \r
 /**\r