-----Original Message-----
From: Intel-wired-lan <redacted> On Behalf Of
Simon Horman
Sent: Thursday, March 20, 2025 10:48 AM
To: Tantilov, Emil S <redacted>
Cc: willemb@google.com; pabeni@redhat.com; netdev@vger.kernel.org;
yuma@redhat.com; Loktionov, Aleksandr [off-list ref];
Dumazet, Eric [off-list ref]; Chittim, Madhu
[off-list ref]; Nguyen, Anthony L
[off-list ref]; kuba@kernel.org;
michal.swiatkowski@linux.intel.com; intel-wired-lan@lists.osuosl.org;
decot@google.com; davem@davemloft.net
Subject: Re: [Intel-wired-lan] [PATCH iwl-net v2] idpf: fix adapter NULL pointer
dereference on reboot

On Mon, Mar 17, 2025 at 10:42:02PM -0700, Emil Tantilov wrote:

quoted

With SRIOV enabled, idpf ends up calling into idpf_remove() twice.
First via idpf_shutdown() and then again when idpf_remove() calls into
sriov_disable(), because the VF devices use the idpf driver, hence the
same remove routine. When that happens, it is possible for the adapter
to be NULL from the first call to idpf_remove(), leading to a NULL
pointer dereference.

echo 1 > /sys/class/net/<netif>/device/sriov_numvfs
reboot

BUG: kernel NULL pointer dereference, address: 0000000000000020 ...
RIP: 0010:idpf_remove+0x22/0x1f0 [idpf] ...
? idpf_remove+0x22/0x1f0 [idpf]
? idpf_remove+0x1e4/0x1f0 [idpf]
pci_device_remove+0x3f/0xb0
device_release_driver_internal+0x19f/0x200
pci_stop_bus_device+0x6d/0x90
pci_stop_and_remove_bus_device+0x12/0x20
pci_iov_remove_virtfn+0xbe/0x120
sriov_disable+0x34/0xe0
idpf_sriov_configure+0x58/0x140 [idpf]
idpf_remove+0x1b9/0x1f0 [idpf]
idpf_shutdown+0x12/0x30 [idpf]
pci_device_shutdown+0x35/0x60
device_shutdown+0x156/0x200
...

Replace the direct idpf_remove() call in idpf_shutdown() with
idpf_vc_core_deinit() and idpf_deinit_dflt_mbx(), which perform the
bulk of the cleanup, such as stopping the init task, freeing IRQs,
destroying the vports and freeing the mailbox. This avoids the calls
to
sriov_disable() in addition to a small netdev cleanup, and destroying
workqueues, which don't seem to be required on shutdown.

Reported-by: Yuying Ma <redacted>
Fixes: e850efed5e15 ("idpf: add module register and probe
functionality")
Reviewed-by: Madhu Chittim <redacted>
Signed-off-by: Emil Tantilov <redacted>
---
Changelog:
v2:
- Updated the description to clarify the path leading up to the crash,
  and the difference in the logic between remove and shutdown as result
  of this change.

v1:
https://lore.kernel.org/intel-wired-lan/20250307003956.22018-1-emil.s.
tantilov@intel.com/

Thanks for the update.

Reviewed-by: Simon Horman <horms@kernel.org>

Tested-by: Samuel Salin <redacted>