[edk2-devel] [PATCH v2 2/4] NetworkPkg: Dhcp6Dxe: Removes duplicate check and replaces with macro

["Doug Flick via groups.io" <dougflick=microsoft.com@groups.io>]

From: Doug Flick <dougflick@microsoft.com>

Removes duplicate check after merge

>
>  //
>  // Verify the PacketCursor is within the packet
>  //
>  if (  (*PacketCursor < Packet->Dhcp6.Option)
>     || (*PacketCursor >= Packet->Dhcp6.Option + (Packet->Size -
sizeof (EFI_DHCP6_HEADER))))
>  {
>    return EFI_INVALID_PARAMETER;
>  }
>

Converts the check to a macro and replaces all instances of the check
with the macro

Cc: Saloni Kasbekar <saloni.kasbekar@intel.com>
Cc: Zachary Clark-williams <zachary.clark-williams@intel.com>

Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
---
 NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c | 46 +++++++++-----------
 1 file changed, 20 insertions(+), 26 deletions(-)

diff --git a/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c b/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c
index 705c665c519d..e4e072562296 100644
--- a/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c
+++ b/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c
@@ -10,6 +10,16 @@
 
 #include "Dhcp6Impl.h"
 
+//
+// Verifies the packet cursor is within the packet
+// otherwise it is invalid
+//
+#define IS_INVALID_PACKET_CURSOR(PacketCursor, Packet) \
+  (((*PacketCursor) < (Packet)->Dhcp6.Option) || \
+   ((*PacketCursor) >= (Packet)->Dhcp6.Option + ((Packet)->Size - sizeof(EFI_DHCP6_HEADER))) \
+  )                                                                            \
+
+
 /**
   Generate client Duid in the format of Duid-llt.
 
@@ -638,9 +648,7 @@ Dhcp6AppendOption (
   //
   // Verify the PacketCursor is within the packet
   //
-  if (  (*PacketCursor < Packet->Dhcp6.Option)
-     || (*PacketCursor >= Packet->Dhcp6.Option + (Packet->Size - sizeof (EFI_DHCP6_HEADER))))
-  {
+  if (IS_INVALID_PACKET_CURSOR (PacketCursor, Packet)) {
     return EFI_INVALID_PARAMETER;
   }
 
@@ -657,15 +665,6 @@ Dhcp6AppendOption (
     return EFI_BUFFER_TOO_SMALL;
   }
 
-  //
-  // Verify the PacketCursor is within the packet
-  //
-  if (  (*PacketCursor < Packet->Dhcp6.Option)
-     || (*PacketCursor >= Packet->Dhcp6.Option + (Packet->Size - sizeof (EFI_DHCP6_HEADER))))
-  {
-    return EFI_INVALID_PARAMETER;
-  }
-
   WriteUnaligned16 ((UINT16 *)*PacketCursor, OptType);
   *PacketCursor += DHCP6_SIZE_OF_OPT_CODE;
   WriteUnaligned16 ((UINT16 *)*PacketCursor, OptLen);
@@ -744,9 +743,7 @@ Dhcp6AppendIaAddrOption (
   //
   // Verify the PacketCursor is within the packet
   //
-  if (  (*PacketCursor < Packet->Dhcp6.Option)
-     || (*PacketCursor >= Packet->Dhcp6.Option + (Packet->Size - sizeof (EFI_DHCP6_HEADER))))
-  {
+  if (IS_INVALID_PACKET_CURSOR (PacketCursor, Packet)) {
     return EFI_INVALID_PARAMETER;
   }
 
@@ -877,9 +874,7 @@ Dhcp6AppendIaOption (
   //
   // Verify the PacketCursor is within the packet
   //
-  if (  (*PacketCursor < Packet->Dhcp6.Option)
-     || (*PacketCursor >= Packet->Dhcp6.Option + (Packet->Size - sizeof (EFI_DHCP6_HEADER))))
-  {
+  if (IS_INVALID_PACKET_CURSOR (PacketCursor, Packet)) {
     return EFI_INVALID_PARAMETER;
   }
 
@@ -940,16 +935,16 @@ Dhcp6AppendIaOption (
     }
   }
 
+  //
+  // Update the packet length
+  //
+  Packet->Length += BytesNeeded;
+
   //
   // Fill the value of Ia option length
   //
   *Len = HTONS ((UINT16)(*PacketCursor - (UINT8 *)Len - 2));
 
-  //
-  // Update the packet length
-  //
-  Packet->Length += BytesNeeded;
-
   return EFI_SUCCESS;
 }
 
@@ -957,6 +952,7 @@ Dhcp6AppendIaOption (
   Append the appointed Elapsed time option to Buf, and move Buf to the end.
 
   @param[in, out] Packet        A pointer to the packet, on success Packet->Length
+                                will be updated.
   @param[in, out] PacketCursor  The pointer in the packet, on success PacketCursor
                                 will be moved to the end of the option.
   @param[in]      Instance      The pointer to the Dhcp6 instance.
@@ -1012,9 +1008,7 @@ Dhcp6AppendETOption (
   //
   // Verify the PacketCursor is within the packet
   //
-  if (  (*PacketCursor < Packet->Dhcp6.Option)
-     || (*PacketCursor >= Packet->Dhcp6.Option + (Packet->Size - sizeof (EFI_DHCP6_HEADER))))
-  {
+  if (IS_INVALID_PACKET_CURSOR (PacketCursor, Packet)) {
     return EFI_INVALID_PARAMETER;
   }
 
-- 
2.34.1



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