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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e6daf496bsm43195395e9.4.2026.05.09.16.37.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 May 2026 16:37:25 -0700 (PDT) From: David Carlier To: anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com Cc: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, David Carlier Subject: [PATCH net] idpf: handle NULL adev in idpf_idc_vdev_mtu_event Date: Sun, 10 May 2026 00:37:22 +0100 Message-ID: <20260509233722.111895-1-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit idpf_idc_vport_dev_ctrl(adapter, false) sets vport->vdev_info->adev to NULL but keeps vport->vdev_info itself. An MTU change after that calls idpf_idc_vdev_mtu_event(), which derefs vdev_info->adev for device_lock() before reaching the (!adev || ...) check. NULL-check vdev_info->adev before locking. Fixes: ed6e1c8796a4 ("idpf: implement IDC vport aux driver MTU change handler") Cc: stable@vger.kernel.org Signed-off-by: David Carlier --- drivers/net/ethernet/intel/idpf/idpf_idc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_idc.c b/drivers/net/ethernet/intel/idpf/idpf_idc.c index b7d6b08fc89e..3ba52a80d52f 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_idc.c +++ b/drivers/net/ethernet/intel/idpf/idpf_idc.c @@ -162,9 +162,12 @@ void idpf_idc_vdev_mtu_event(struct iidc_rdma_vport_dev_info *vdev_info, set_bit(event_type, event.type); + if (!vdev_info->adev) + return; + device_lock(&vdev_info->adev->dev); adev = vdev_info->adev; - if (!adev || !adev->dev.driver) + if (!adev->dev.driver) goto unlock; iadrv = container_of(adev->dev.driver, struct iidc_rdma_vport_auxiliary_drv, -- 2.53.0