Re: [PATCH 2/2] crypto: qat: ADF_STATUS_PF_RUNNING should be set after adf_dev_init

[Andy Shevchenko <andy.shevchenko@gmail.com>]

On Fri, Mar 12, 2021 at 9:50 AM Tong Zhang <ztong0001@gmail.com> 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.

Makes sense, but please leave only ~2-3 (significant) lines from the
below noisy dump
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
(after making commit message neat)

> [    7.178008] ==================================================================
> [    7.178404] BUG: KASAN: user-memory-access in __mutex_lock.isra.0+0x1ac/0x7c0
> [    7.178800] Read of size 4 at addr 000000000000f434 by task modprobe/96
> [    7.179169]
> [    7.179257] CPU: 0 PID: 96 Comm: modprobe Not tainted 5.12.0-rc2-00338-gf78d76e72a46-dirty #86
> [    7.179730] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-48-gd9c812dda519-4
> [    7.180345] Call Trace:
> [    7.180485]  dump_stack+0x8a/0xb5
> [    7.180676]  kasan_report.cold+0x10f/0x111
> [    7.180907]  ? __mutex_lock.isra.0+0x1ac/0x7c0
> [    7.181156]  __mutex_lock.isra.0+0x1ac/0x7c0
> [    7.181394]  ? finish_task_switch+0x12f/0x360
> [    7.181640]  ? __switch_to+0x339/0x6b0
> [    7.181852]  ? ww_mutex_lock_interruptible+0x150/0x150
> [    7.182138]  ? __sched_text_start+0x8/0x8
> [    7.182363]  ? vprintk_emit+0x91/0x170
> [    7.182576]  mutex_lock+0xc9/0xd0
> [    7.182765]  ? __mutex_lock_slowpath+0x10/0x10
> [    7.183016]  ? swsusp_write.cold+0x208/0x208
> [    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]
> [    7.184403]  ? adf_remove+0x70/0x70 [qat_dh895xccvf]
> [    7.184681]  ? _raw_spin_lock_irqsave+0x7b/0xd0
> [    7.184936]  ? _raw_spin_unlock_irqrestore+0xd/0x20
> [    7.185209]  ? adf_remove+0x70/0x70 [qat_dh895xccvf]
> [    7.185489]  local_pci_probe+0x6f/0xb0
> [    7.185702]  pci_device_probe+0x1e9/0x2f0
> [    7.185928]  ? pci_device_remove+0xf0/0xf0
> [    7.186159]  ? sysfs_do_create_link_sd.isra.0+0x76/0xe0
> [    7.186458]  really_probe+0x161/0x420
> [    7.186665]  driver_probe_device+0x6d/0xd0
> [    7.186894]  device_driver_attach+0x82/0x90
> [    7.187131]  ? device_driver_attach+0x90/0x90
> [    7.187375]  __driver_attach+0x60/0x100
> [    7.187591]  ? device_driver_attach+0x90/0x90
> [    7.187835]  bus_for_each_dev+0xe1/0x140
> [    7.188057]  ? subsys_dev_iter_exit+0x10/0x10
> [    7.188302]  ? klist_node_init+0x61/0x80
> [    7.188524]  bus_add_driver+0x254/0x2a0
> [    7.188740]  driver_register+0xd3/0x150
> [    7.188956]  ? 0xffffffffc0050000
> [    7.189143]  adfdrv_init+0x2b/0x1000 [qat_dh895xccvf]
> [    7.189427]  do_one_initcall+0x84/0x250
> [    7.189644]  ? trace_event_raw_event_initcall_finish+0x150/0x150
> [    7.189977]  ? _raw_spin_unlock_irqrestore+0xd/0x20
> [    7.190250]  ? create_object+0x395/0x510
> [    7.190472]  ? kasan_unpoison+0x21/0x50
> [    7.190689]  do_init_module+0xf8/0x350
> [    7.190901]  load_module+0x40c5/0x4410
> [    7.191121]  ? module_frob_arch_sections+0x20/0x20
> [    7.191390]  ? kernel_read_file+0x1cd/0x3e0
> [    7.191626]  ? __do_sys_finit_module+0x108/0x170
> [    7.191885]  __do_sys_finit_module+0x108/0x170
> [    7.192134]  ? __ia32_sys_init_module+0x40/0x40
> [    7.192389]  ? file_open_root+0x200/0x200
> [    7.192615]  ? do_sys_open+0x85/0xe0
> [    7.192817]  ? filp_open+0x50/0x50
> [    7.193010]  ? exit_to_user_mode_prepare+0xfc/0x130
> [    7.193283]  do_syscall_64+0x33/0x40
> [    7.193486]  entry_SYSCALL_64_after_hwframe+0x44/0xae
> [    7.193770] RIP: 0033:0x7f6ad21b4cf7
> [    7.193971] Code: 48 89 57 30 48 8b 04 24 48 89 47 38 e9 1d a0 02 00 48 89 f8 48 89 f7 48 89 d6 41
> [    7.194991] RSP: 002b:00007ffe2a5d9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [    7.195408] RAX: ffffffffffffffda RBX: 0000000000882a70 RCX: 00007f6ad21b4cf7
> [    7.195801] RDX: 0000000000000000 RSI: 00000000008819e0 RDI: 0000000000000003
> [    7.196193] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
> [    7.196588] R10: 00007f6ad2218300 R11: 0000000000000246 R12: 00000000008819e0
> [    7.196979] R13: 0000000000000000 R14: 0000000000881dd0 R15: 0000000000000001
> [    7.197372] ==================================================================
>
> Signed-off-by: Tong Zhang <ztong0001@gmail.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
>


-- 
With Best Regards,
Andy Shevchenko