linux-kernel - Re: [PATCH v4 2/2] crypto: qat: ADF_STATUS_PF_RUNNING should be set after adf_dev

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Date:   Thu, 18 Mar 2021 23:41:07 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     Giovanni Cabiddu <giovanni.cabiddu@...el.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Fiona Trahe <fiona.trahe@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>, qat-linux@...el.com,
        linux-crypto <linux-crypto@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Wojciech Ziemba <wojciech.ziemba@...el.com>
Subject: Re: [PATCH v4 2/2] crypto: qat: ADF_STATUS_PF_RUNNING should be set
 after adf_dev_init

Thanks,
I fixed the headline and sent it as v5.
- Tong

On Thu, Mar 18, 2021 at 1:18 PM Giovanni Cabiddu
<giovanni.cabiddu@...el.com> wrote:
>
> Just a minor comment on the commit message:
> crypto: qat: ADF_STATUS_PF_RUNNING ...
>            ^
> Patches to the qat driver have the following headline:
>         crypto: qat -
> not
>         crypto: qat :
>
> Regards,
>
> --
> Giovanni
>
> On Thu, Mar 18, 2021 at 12:21:05PM -0400, Tong Zhang wrote:
> > ADF_STATUS_PF_RUNNING is (only) used and checked by adf_vf2pf_shutdown()
> > before calling adf_iov_putmsg()->mutex_lock(vf2pf_lock), however the
> > vf2pf_lock is initialized in adf_dev_init(), which can fail and when it
> > fail, the vf2pf_lock is either not initialized or destroyed, a subsequent
> > use of vf2pf_lock will cause issue.
> > To fix this issue, only set this flag if adf_dev_init() returns 0.
> >
> > [    7.178404] BUG: KASAN: user-memory-access in __mutex_lock.isra.0+0x1ac/0x7c0
> > [    7.180345] Call Trace:
> > [    7.182576]  mutex_lock+0xc9/0xd0
> > [    7.183257]  adf_iov_putmsg+0x118/0x1a0 [intel_qat]
> > [    7.183541]  adf_vf2pf_shutdown+0x4d/0x7b [intel_qat]
> > [    7.183834]  adf_dev_shutdown+0x172/0x2b0 [intel_qat]
> > [    7.184127]  adf_probe+0x5e9/0x600 [qat_dh895xccvf]
> >
> > Signed-off-by: Tong Zhang <ztong0001@...il.com>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> > Fixes: 25c6ffb249f6 ("crypto: qat - check if PF is running")
> > Acked-by: Giovanni Cabiddu <giovanni.cabiddu@...el.com>
> > ---
> >  drivers/crypto/qat/qat_c3xxxvf/adf_drv.c    | 4 ++--
> >  drivers/crypto/qat/qat_c62xvf/adf_drv.c     | 4 ++--
> >  drivers/crypto/qat/qat_dh895xccvf/adf_drv.c | 4 ++--
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/crypto/qat/qat_c3xxxvf/adf_drv.c b/drivers/crypto/qat/qat_c3xxxvf/adf_drv.c
> > index 1d1532e8fb6d..067ca5e17d38 100644
> > --- a/drivers/crypto/qat/qat_c3xxxvf/adf_drv.c
> > +++ b/drivers/crypto/qat/qat_c3xxxvf/adf_drv.c
> > @@ -184,12 +184,12 @@ static int adf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >       if (ret)
> >               goto out_err_free_reg;
> >
> > -     set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
> > -
> >       ret = adf_dev_init(accel_dev);
> >       if (ret)
> >               goto out_err_dev_shutdown;
> >
> > +     set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
> > +
> >       ret = adf_dev_start(accel_dev);
> >       if (ret)
> >               goto out_err_dev_stop;
> > diff --git a/drivers/crypto/qat/qat_c62xvf/adf_drv.c b/drivers/crypto/qat/qat_c62xvf/adf_drv.c
> > index 04742a6d91ca..51ea88c0b17d 100644
> > --- a/drivers/crypto/qat/qat_c62xvf/adf_drv.c
> > +++ b/drivers/crypto/qat/qat_c62xvf/adf_drv.c
> > @@ -184,12 +184,12 @@ static int adf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >       if (ret)
> >               goto out_err_free_reg;
> >
> > -     set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
> > -
> >       ret = adf_dev_init(accel_dev);
> >       if (ret)
> >               goto out_err_dev_shutdown;
> >
> > +     set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
> > +
> >       ret = adf_dev_start(accel_dev);
> >       if (ret)
> >               goto out_err_dev_stop;
> > diff --git a/drivers/crypto/qat/qat_dh895xccvf/adf_drv.c b/drivers/crypto/qat/qat_dh895xccvf/adf_drv.c
> > index c972554a755e..29999da716cc 100644
> > --- a/drivers/crypto/qat/qat_dh895xccvf/adf_drv.c
> > +++ b/drivers/crypto/qat/qat_dh895xccvf/adf_drv.c
> > @@ -184,12 +184,12 @@ static int adf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >       if (ret)
> >               goto out_err_free_reg;
> >
> > -     set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
> > -
> >       ret = adf_dev_init(accel_dev);
> >       if (ret)
> >               goto out_err_dev_shutdown;
> >
> > +     set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
> > +
> >       ret = adf_dev_start(accel_dev);
> >       if (ret)
> >               goto out_err_dev_stop;
> > --
> > 2.25.1
> >