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charset="utf-8" In the previous implementation, vf_state is allocated memory only when VF is enabled. However, net_device_ops::ndo_set_vf_mac() may be called before VF is enabled to configure the MAC address of VF. If this is the case, enetc_pf_set_vf_mac() will access vf_state, resulting in access to a null pointer. The simplified error log is as follows. root@ls1028ardb:~# ip link set eno0 vf 1 mac 00:0c:e7:66:77:89 [ 173.543315] Unable to handle kernel NULL pointer dereference at virtual = address 0000000000000004 [ 173.637254] pc : enetc_pf_set_vf_mac+0x3c/0x80 Message from sy [ 173.641973] lr : do_setlink+0x4a8/0xec8 [ 173.732292] Call trace: [ 173.734740] enetc_pf_set_vf_mac+0x3c/0x80 [ 173.738847] __rtnl_newlink+0x530/0x89c [ 173.742692] rtnl_newlink+0x50/0x7c [ 173.746189] rtnetlink_rcv_msg+0x128/0x390 [ 173.750298] netlink_rcv_skb+0x60/0x130 [ 173.754145] rtnetlink_rcv+0x18/0x24 [ 173.757731] netlink_unicast+0x318/0x380 [ 173.761665] netlink_sendmsg+0x17c/0x3c8 Fixes: d4fd0404c1c9 ("enetc: Introduce basic PF and VF ENETC ethernet drive= rs") Signed-off-by: Wei Fang Reviewed-by: Vladimir Oltean Tested-by: Vladimir Oltean --- .../net/ethernet/freescale/enetc/enetc_pf.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/= ethernet/freescale/enetc/enetc_pf.c index 8f6b0bf48139..c95a7c083b0f 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c @@ -665,19 +665,11 @@ static int enetc_sriov_configure(struct pci_dev *pdev= , int num_vfs) =20 if (!num_vfs) { enetc_msg_psi_free(pf); - kfree(pf->vf_state); pf->num_vfs =3D 0; pci_disable_sriov(pdev); } else { pf->num_vfs =3D num_vfs; =20 - pf->vf_state =3D kcalloc(num_vfs, sizeof(struct enetc_vf_state), - GFP_KERNEL); - if (!pf->vf_state) { - pf->num_vfs =3D 0; - return -ENOMEM; - } - err =3D enetc_msg_psi_init(pf); if (err) { dev_err(&pdev->dev, "enetc_msg_psi_init (%d)\n", err); @@ -696,7 +688,6 @@ static int enetc_sriov_configure(struct pci_dev *pdev, = int num_vfs) err_en_sriov: enetc_msg_psi_free(pf); err_msg_psi: - kfree(pf->vf_state); pf->num_vfs =3D 0; =20 return err; @@ -1286,6 +1277,12 @@ static int enetc_pf_probe(struct pci_dev *pdev, pf =3D enetc_si_priv(si); pf->si =3D si; pf->total_vfs =3D pci_sriov_get_totalvfs(pdev); + if (pf->total_vfs) { + pf->vf_state =3D kcalloc(pf->total_vfs, sizeof(struct enetc_vf_state), + GFP_KERNEL); + if (!pf->vf_state) + goto err_alloc_vf_state; + } =20 err =3D enetc_setup_mac_addresses(node, pf); if (err) @@ -1363,6 +1360,8 @@ static int enetc_pf_probe(struct pci_dev *pdev, free_netdev(ndev); 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Thu, 31 Oct 2024 06:18:01 +0000 Received: from PAXPR04MB8510.eurprd04.prod.outlook.com ([fe80::a7c2:e2fa:8e04:40db]) by PAXPR04MB8510.eurprd04.prod.outlook.com ([fe80::a7c2:e2fa:8e04:40db%7]) with mapi id 15.20.8093.027; Thu, 31 Oct 2024 06:18:01 +0000 From: Wei Fang To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, andrew+netdev@lunn.ch, claudiu.manoil@nxp.com, vladimir.oltean@nxp.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev Subject: [PATCH net 2/2] net: enetc: prevent PF from configuring MAC address for an enabled VF Date: Thu, 31 Oct 2024 14:02:47 +0800 Message-Id: <20241031060247.1290941-3-wei.fang@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241031060247.1290941-1-wei.fang@nxp.com> References: <20241031060247.1290941-1-wei.fang@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SG2PR04CA0169.apcprd04.prod.outlook.com (2603:1096:4::31) To PAXPR04MB8510.eurprd04.prod.outlook.com (2603:10a6:102:211::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB8510:EE_|DU2PR04MB8742:EE_ X-MS-Office365-Filtering-Correlation-Id: f988f7b2-f882-466f-b4ed-08dcf973c582 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|52116014|1800799024|38350700014; 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charset="utf-8" If PF changes the MAC address of VF after VF is enabled, VF cannot sense the change of its own MAC address, and the MAC address in VF's net_device is still the original MAC address, which will cause the VF's network to not work properly. Therefore, we should restrict PF to configure VF's MAC address only when VF is disabled. Of course, another solution is to notify VF of this event when PF changes VF's MAC address, but the PSI-to-VSI messaging is not implemented in the current PF and VF drivers, so this solution is not suitable at present, If PSI-to-VSI messaging is supported in the future, we can remove the current restriction to enhance the PF's ability to configure the VF's MAC address. Fixes: d4fd0404c1c9 ("enetc: Introduce basic PF and VF ENETC ethernet drive= rs") Signed-off-by: Wei Fang Reviewed-by: Vladimir Oltean Tested-by: Vladimir Oltean --- drivers/net/ethernet/freescale/enetc/enetc_pf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/= ethernet/freescale/enetc/enetc_pf.c index c95a7c083b0f..a295236cd931 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c @@ -343,11 +343,18 @@ static int enetc_pf_set_vf_mac(struct net_device *nde= v, int vf, u8 *mac) { struct enetc_ndev_priv *priv =3D netdev_priv(ndev); struct enetc_pf *pf =3D enetc_si_priv(priv->si); + struct device *dev =3D &pf->si->pdev->dev; struct enetc_vf_state *vf_state; =20 if (vf >=3D pf->total_vfs) return -EINVAL; =20 + if (vf + 1 <=3D pf->num_vfs) { + dev_err(dev, "Cannot set MAC address for an enabled VF\n"); + + return -EPERM; + } + if (!is_valid_ether_addr(mac)) return -EADDRNOTAVAIL; =20 --=20 2.34.1