6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Wei Fang <wei.fang@xxxxxxx>
[ Upstream commit e15c5506dd39885cd047f811a64240e2e8ab401b ]
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 drivers")
Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
Reviewed-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
Tested-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
Link: https://patch.msgid.link/20241031060247.1290941-2-wei.fang@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../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 c153dc083aff0..a856047f1dfd6 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)
if (!num_vfs) {
enetc_msg_psi_free(pf);
- kfree(pf->vf_state);
pf->num_vfs = 0;
pci_disable_sriov(pdev);
} else {
pf->num_vfs = num_vfs;
- pf->vf_state = kcalloc(num_vfs, sizeof(struct enetc_vf_state),
- GFP_KERNEL);
- if (!pf->vf_state) {
- pf->num_vfs = 0;
- return -ENOMEM;
- }
-
err = 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 = 0;
return err;
@@ -1283,6 +1274,12 @@ static int enetc_pf_probe(struct pci_dev *pdev,
pf = enetc_si_priv(si);
pf->si = si;
pf->total_vfs = pci_sriov_get_totalvfs(pdev);
+ if (pf->total_vfs) {
+ pf->vf_state = kcalloc(pf->total_vfs, sizeof(struct enetc_vf_state),
+ GFP_KERNEL);
+ if (!pf->vf_state)
+ goto err_alloc_vf_state;
+ }
err = enetc_setup_mac_addresses(node, pf);
if (err)
@@ -1360,6 +1357,8 @@ static int enetc_pf_probe(struct pci_dev *pdev,
free_netdev(ndev);
err_alloc_netdev:
err_setup_mac_addresses:
+ kfree(pf->vf_state);
+err_alloc_vf_state:
enetc_psi_destroy(pdev);
err_psi_create:
return err;
@@ -1386,6 +1385,7 @@ static void enetc_pf_remove(struct pci_dev *pdev)
enetc_free_si_resources(priv);
free_netdev(si->ndev);
+ kfree(pf->vf_state);
enetc_psi_destroy(pdev);
}
--
2.43.0
