linux-kernel - Re: [BUG] vDPA/ifcvf: got a warning when removing the module

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Date:   Mon, 23 May 2022 12:15:16 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Zheyu Ma <zheyuma97@...il.com>
Cc:     mst <mst@...hat.com>, Zhu Lingshan <lingshan.zhu@...el.com>,
        Yongji Xie <xieyongji@...edance.com>,
        Eli Cohen <elic@...dia.com>, Parav Pandit <parav@...dia.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] vDPA/ifcvf: got a warning when removing the module

On Sat, May 21, 2022 at 10:27 PM Zheyu Ma <zheyuma97@...il.com> wrote:
>
> Hello,
>
> I found a bug in the ifcvf driver.
> When removing the module, I got the following warning:
>
> [   14.478123] general protection fault, probably for non-canonical
> address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI
> [   14.478701] KASAN: null-ptr-deref in range
> [0x0000000000000028-0x000000000000002f]
> [   14.479922] RIP: 0010:vdpa_mgmtdev_unregister+0x39/0x150
> [   14.484063] Call Trace:
> [   14.484186]  <TASK>
> [   14.484292]  ? _raw_spin_unlock_irqrestore+0x3d/0x60
> [   14.484536]  ifcvf_remove+0x3a/0x50 [ifcvf]
> [   14.484743]  pci_device_remove+0x92/0x240
>
> The reason is that the 'ifcvf_mgmt_dev' is zero which means that
> ifcvf_vdpa_dev_add() was not executed.
> Since I am not familiar with the driver, I cannot find a proper solution for it.
>

Looks like the drv data needs to be set in probe(). Could you pleas
try to the attached patch? (compile test only).

Thanks

> Zheyu Ma
>

Download attachment "0001-vdpa-ifcvf-set-pci-driver-data-in-probe.patch" of type "application/octet-stream" (1265 bytes)