From 69e856dfa56cebfba1abf160f3c86458dde850d4 Mon Sep 17 00:00:00 2001 From: Hao Wu Date: Tue, 15 Nov 2016 15:39:44 +0800 Subject: [PATCH] MdeModulePkg/DxeNetLib: Rewrite NetblockChecksum function logic This commit rewrites the logic for NetblockChecksum. It processes the checksum of the left-over byte first to prevent possible mis-reports by static code checkers. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu Reviewed-by: Fu Siyuan Reviewed-by: Ye Ting Reviewed-by: Wu Jiaxin --- MdeModulePkg/Library/DxeNetLib/NetBuffer.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/MdeModulePkg/Library/DxeNetLib/NetBuffer.c b/MdeModulePkg/Library/DxeNetLib/NetBuffer.c index bbbdbc048a..95cb71714b 100644 --- a/MdeModulePkg/Library/DxeNetLib/NetBuffer.c +++ b/MdeModulePkg/Library/DxeNetLib/NetBuffer.c @@ -1,7 +1,7 @@ /** @file Network library functions providing net buffer operation support. -Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.
+Copyright (c) 2005 - 2016, Intel Corporation. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at @@ -1661,19 +1661,19 @@ NetblockChecksum ( Sum = 0; + // + // Add left-over byte, if any + // + if (Len % 2 != 0) { + Sum += *(Bulk + Len - 1); + } + while (Len > 1) { Sum += *(UINT16 *) Bulk; Bulk += 2; Len -= 2; } - // - // Add left-over byte, if any - // - if (Len > 0) { - Sum += *(UINT8 *) Bulk; - } - // // Fold 32-bit sum to 16 bits //