On Jul 16, 2019, at 9:58 AM, Carsey, Jaben <jaben.carsey@intel.com> wrote:Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
Thanks
-Jaben-----Original Message-----
From: Gao, Zhichao
Sent: Tuesday, July 16, 2019 2:12 AM
To: devel@edk2.groups.io
Cc: Carsey, Jaben <jaben.carsey@intel.com>; Ni, Ray <ray.ni@intel.com>;
Andrew Fish <afish@apple.com>
Subject: [PATCH V2] ShellPkg/Type.c: Add value check before (LoopVar - 1)
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1964
If the file begin with single line Feed ('\n'), then
"AsciiChar == '\n' && ((CHAR8*)Buffer)[LoopVar-1] != '\r'"
would cause a underflow. Add this condition
"(AsciiChar == '\n' && LoopVar == 0)" before it to make sure
(LoopVar - 1) would never encounter a underflow.
Same change in Unicode section.
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Andrew Fish <afish@apple.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
---
V2:
1. Update the copyright
2. Fix the same issue in unicode section
3. Fix typo
.../Library/UefiShellLevel3CommandsLib/Type.c | 24 ++++++++++---------
1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
b/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
index 4efc0a8e24..f0aa57af3d 100644
--- a/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
+++ b/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
@@ -2,7 +2,7 @@
Main file for Type shell level 3 function.
(C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P.<BR>
- Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved. <BR>
+ Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -78,12 +78,13 @@ TypeFileByHandle (
// Allow Line Feed (LF) (0xA) & Carriage Return (CR) (0xD)
// characters to be displayed as is.
//
- if (AsciiChar == '\n' && ((CHAR8*)Buffer)[LoopVar-1] != '\r') {
+ if ((AsciiChar == '\n' && LoopVar == 0) ||
+ (AsciiChar == '\n' && ((CHAR8*)Buffer)[LoopVar-1] != '\r')) {
//
- // In case Line Feed (0xA) is encountered & Carriage Return (0xD)
- // was not the previous character, print CR and LF. This is because
- // Shell 2.0 requires carriage return with line feed for displaying
- // each new line from left.
+ // In case file begin with single line Feed or Line Feed (0xA) is
+ // encountered & Carriage Return (0xD) was not previous character,
+ // print CR and LF. This is because Shell 2.0 requires carriage
+ // return with line feed for displaying each new line from left.
//
ShellPrintEx (-1, -1, L"\r\n");
continue;
@@ -121,12 +122,13 @@ TypeFileByHandle (
// Allow Line Feed (LF) (0xA) & Carriage Return (CR) (0xD)
// characters to be displayed as is.
//
- if (Ucs2Char == '\n' && ((CHAR16*)Buffer)[LoopVar-1] != '\r') {
+ if ((Ucs2Char == '\n' && LoopVar == 0) ||
+ (Ucs2Char == '\n' && ((CHAR16*)Buffer)[LoopVar-1] != '\r')) {
//
- // In case Line Feed (0xA) is encountered & Carriage Return (0xD)
- // was not the previous character, print CR and LF. This is because
- // Shell 2.0 requires carriage return with line feed for displaying
- // each new line from left.
+ // In case file begin with single line Feed or Line Feed (0xA) is
+ // encountered & Carriage Return (0xD) was not previous character,
+ // print CR and LF. This is because Shell 2.0 requires carriage
+ // return with line feed for displaying each new line from left.
//
ShellPrintEx (-1, -1, L"\r\n");
continue;
--
2.21.0.windows.1