linux-kernel - RE: [Intel-wired-lan] [PATCH net v2] ice: Fix incorrect locking in ice_vc_process_vf

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Message-ID: <SJ0PR11MB5629903816D77836D62E8EAEABED9@SJ0PR11MB5629.namprd11.prod.outlook.com>
Date:   Tue, 12 Apr 2022 10:39:01 +0000
From:   "Jankowski, Konrad0" <konrad0.jankowski@...el.com>
To:     "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "Lobakin, Alexandr" <alexandr.lobakin@...el.com>
CC:     ivecera <ivecera@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        mschmidt <mschmidt@...hat.com>,
        Brett Creeley <brett@...sando.io>,
        open list <linux-kernel@...r.kernel.org>,
        poros <poros@...hat.com>,
        "moderated list:INTEL ETHERNET DRIVERS" 
        <intel-wired-lan@...ts.osuosl.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "Paolo Abeni" <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: RE: [Intel-wired-lan] [PATCH net v2] ice: Fix incorrect locking in
 ice_vc_process_vf_msg()



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Tony Nguyen
> Sent: Friday, April 8, 2022 6:01 PM
> To: Lobakin, Alexandr <alexandr.lobakin@...el.com>
> Cc: ivecera <ivecera@...hat.com>; netdev@...r.kernel.org; mschmidt
> <mschmidt@...hat.com>; Brett Creeley <brett@...sando.io>; open list
> <linux-kernel@...r.kernel.org>; poros <poros@...hat.com>; moderated
> list:INTEL ETHERNET DRIVERS <intel-wired-lan@...ts.osuosl.org>; Jakub
> Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; David S.
> Miller <davem@...emloft.net>
> Subject: Re: [Intel-wired-lan] [PATCH net v2] ice: Fix incorrect locking in
> ice_vc_process_vf_msg()
> 
> 
> On 4/8/2022 6:47 AM, Alexander Lobakin wrote:
> > From: Ivan Vecera <ivecera@...hat.com>
> > Date: Fri,  1 Apr 2022 12:40:52 +0200
> >
> >> Usage of mutex_trylock() in ice_vc_process_vf_msg() is incorrect
> >> because message sent from VF is ignored and never processed.
> >>
> >> Use mutex_lock() instead to fix the issue. It is safe because this
> >> mutex is used to prevent races between VF related NDOs and handlers
> >> processing request messages from VF and these handlers are running in
> >> ice_service_task() context. Additionally move this mutex lock prior
> >> ice_vc_is_opcode_allowed() call to avoid potential races during
> >> allowlist acccess.
> >>
> >> Fixes: e6ba5273d4ed ("ice: Fix race conditions between virtchnl
> >> handling and VF ndo ops")
> >> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
> > Hey Tony,
> >
> > I guess you missed this one due to being on a vacation previously.
> > It's been previously reviewed IIRC, could you take it into net-queue?
> 
> I remember applying this but I don't see it on the tree so I must be mistaken.
> :( I'll get it applied, thanks for catching.
> 
> -Tony
> 
> >> ---
> >>   drivers/net/ethernet/intel/ice/ice_virtchnl.c | 21 +++++++------------
> >>   1 file changed, 7 insertions(+), 14 deletions(-)
> >>
> >> diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> >> b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> >> index 3f1a63815bac..a465f3743ffc 100644
> >> --- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> >> +++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> >> @@ -3642,14 +3642,6 @@ void ice_vc_process_vf_msg(struct ice_pf *pf,

Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>