[edk2-devel] [PATCH] ShellPkg/Type.c: Add value check before (LoopVar - 1)
Carsey, Jaben
jaben.carsey at intel.com
Mon Jul 15 14:30:57 UTC 2019
Please remove the typo (there is an extra S after 'return'). This line:
// return Swith line feed for displaying each new line from left.
> -----Original Message-----
> From: Gao, Zhichao
> Sent: Monday, July 15, 2019 12:30 AM
> To: devel at edk2.groups.io
> Cc: Carsey, Jaben <jaben.carsey at intel.com>; Ni, Ray <ray.ni at intel.com>;
> Andrew Fish <afish at apple.com>
> Subject: [PATCH] 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.
>
> Cc: Jaben Carsey <jaben.carsey at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Andrew Fish <afish at apple.com>
> Signed-off-by: Zhichao Gao <zhichao.gao at intel.com>
> ---
> ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
> b/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
> index 4efc0a8e24..c1f670c713 100644
> --- a/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
> +++ b/ShellPkg/Library/UefiShellLevel3CommandsLib/Type.c
> @@ -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 Swith line feed for displaying each new line from left.
> //
> ShellPrintEx (-1, -1, L"\r\n");
> continue;
> --
> 2.21.0.windows.1
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