Re: [edk2-devel] [PATCH v2] NetworkPkg/DxeNetLib: Change the order of conditions in IF statement

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 5/20/20 5:08 AM, Zhang, Shenglei wrote:
> The condition, NET_HEADSPACE(&(Nbuf->BlockOp[Index])) < Len, is
> meaningless if Index = 0. So checking 'Index != 0' should be
> performed first in the if statement.
> 
> Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
> Cc: Siyuan Fu <siyuan.fu@intel.com>
> Cc: Jiaxin Wu <jiaxin.wu@intel.com>
> Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
> ---
> 
> v2: Update 'Index > 0' to 'Index != 0'
> 
>   NetworkPkg/Library/DxeNetLib/NetBuffer.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/NetworkPkg/Library/DxeNetLib/NetBuffer.c b/NetworkPkg/Library/DxeNetLib/NetBuffer.c
> index a232802c9a21..329a17623d94 100644
> --- a/NetworkPkg/Library/DxeNetLib/NetBuffer.c
> +++ b/NetworkPkg/Library/DxeNetLib/NetBuffer.c
> @@ -1063,7 +1063,7 @@ NetbufAllocSpace (
>       } else {
>         NetbufGetByte (Nbuf, 0, &Index);
>   
> -      if ((NET_HEADSPACE(&(Nbuf->BlockOp[Index])) < Len) && (Index > 0)) {
> +      if ((Index != 0) && (NET_HEADSPACE(&(Nbuf->BlockOp[Index])) < Len)) {

Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>

>           Index--;
>         }
>       }
>