Re: [RFC v1 0/6] pseries/papr-hvpipe: Fix and simplify papr-hvpipe

[Haren Myneni]

On Tue, 2026-04-07 at 20:01 +0530, Ritesh Harjani (IBM) wrote:
> Haren reported a UAF / null ptr deref issue here [1]. While reviewing
> that and
> going over papr-hvpipe code, I found couple of more issues around the
> usage of
> copy_to_user() and few refactoring which simplifies the code.
> 
> This patch series is an attempt to that. Note that this is only
> compile tested
> on pseries for now.
> 
> Haren, I will kindly need your help in verifying this please. Let me
> know if we
> have a selftests or any other test framework for this, which I can
> utilize too.

Thanks for fixes and cleanup the code. The testing should be part of
HMC/RCST framework. So we do not have selftests. I will work with HMC
to verify these patches. 

> 
> [1]:
> https://lore.kernel.org/linuxppc-dev/20260317040444.2785741-1-haren@xxxxxxxxxxxxx/
> 
> 
> Ritesh Harjani (IBM) (6):
>   pseries/papr-hvpipe: Fix null ptr deref in
> papr_hvpipe_dev_create_handle
>   pseries/papr-hvpipe: Fix the usage of copy_to_user()
>   pseries/papr-hvpipe: Simplify spin_unlock() usage in
> papr_hvpipe_handle_release
>   pseries/papr-hvpipe: Kill task_struct pointer from struct
> hvpipe_source_info
>   pseries/papr-hvpipe: Refactor and simplify hvpipe_rtas_recv_msg()
>   pseries/papr-hvpipe: Simplify error handling in papr_hvpipe_init()
> 
>  arch/powerpc/platforms/pseries/papr-hvpipe.c | 135 +++++++++--------
> --
>  arch/powerpc/platforms/pseries/papr-hvpipe.h |   1 -
>  2 files changed, 66 insertions(+), 70 deletions(-)
> 
> --
> 2.39.5