# Re: powerpc/32: fix again csum\_partial\_copy\_generic()

- From: Michael Ellerman \<hidden\>
- Date: 2016-09-08 09:47:55 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2016/09/4831470
- Thread: https://ratatoskr.run/linuxppc-dev/2016/08/4822995/t.md

```text
On Fri, 2016-26-08 at 14:45:13 UTC, Christophe Leroy wrote:
> commit 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic()
> based on copy_tofrom_user()") introduced a bug when destination
> address is odd and len is lower than cacheline size.
> 
> In that case the resulting csum value doesn't have to be rotated one
> byte because the cache-aligned copy part is skipped so no alignment
> is performed.
> 
> Fixes: 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()")
> Cc: <redacted>
> Reported-by: Alessio Igor Bogani <redacted>
> Signed-off-by: Christophe Leroy <redacted>
> Tested-by: Alessio Igor Bogani <redacted>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/8540571e01f973d321b0821f4f

cheers
```