[PATCH] rte_memcpy: fix off by one for size 16 and 32

[Stephen Hemminger]

On Sat,  2 Mar 2024 12:49:23 -0800
Stephen Hemminger <stephen at networkplumber.org> wrote:

> The rte_memcpy code would do extra instructions for size 16
> and 32 which potentially could reference past end of data.
> 
> For size of 16, only single mov16 is needed.
> same for size of 32, only single mov32.
> 
> Fixes: f5472703c0bd ("eal: optimize aligned memcpy on x86")
> Fixes: d35cc1fe6a7a ("eal/x86: revert select optimized memcpy at run-time")
> 
> Suggested-by: Morten Brørup <mb at smartsharesystems.com>
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>

Self-NAK, more is needed here.

The code has lots of pre-existing bugs where it will reference past the end
of the data in some cases.