This is a note to let you know that I've just added the patch titled qlcnic: potential dereference null pointer of rx_queue->page_ring to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: qlcnic-potential-dereference-null-pointer-of-rx_queu.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 766634292b9584385b1a142fb4ebce8a42c26210 Author: Jiasheng Jiang <jiasheng@xxxxxxxxxxx> Date: Fri Dec 17 17:39:11 2021 +0800 qlcnic: potential dereference null pointer of rx_queue->page_ring [ Upstream commit 60ec7fcfe76892a1479afab51ff17a4281923156 ] The return value of kcalloc() needs to be checked. To avoid dereference of null pointer in case of the failure of alloc. Therefore, it might be better to change the return type of qlcnic_sriov_alloc_vlans() and return -ENOMEM when alloc fails and return 0 the others. Also, qlcnic_sriov_set_guest_vlan_mode() and __qlcnic_pci_sriov_enable() should deal with the return value of qlcnic_sriov_alloc_vlans(). Fixes: 154d0c810c53 ("qlcnic: VLAN enhancement for 84XX adapters") Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov.h index 5f327659efa7a..85b688f60b876 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov.h +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov.h @@ -202,7 +202,7 @@ int qlcnic_sriov_get_vf_vport_info(struct qlcnic_adapter *, struct qlcnic_info *, u16); int qlcnic_sriov_cfg_vf_guest_vlan(struct qlcnic_adapter *, u16, u8); void qlcnic_sriov_free_vlans(struct qlcnic_adapter *); -void qlcnic_sriov_alloc_vlans(struct qlcnic_adapter *); +int qlcnic_sriov_alloc_vlans(struct qlcnic_adapter *); bool qlcnic_sriov_check_any_vlan(struct qlcnic_vf_info *); void qlcnic_sriov_del_vlan_id(struct qlcnic_sriov *, struct qlcnic_vf_info *, u16); diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c index 77e386ebff09c..98275f18a87b0 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c @@ -433,7 +433,7 @@ static int qlcnic_sriov_set_guest_vlan_mode(struct qlcnic_adapter *adapter, struct qlcnic_cmd_args *cmd) { struct qlcnic_sriov *sriov = adapter->ahw->sriov; - int i, num_vlans; + int i, num_vlans, ret; u16 *vlans; if (sriov->allowed_vlans) @@ -444,7 +444,9 @@ static int qlcnic_sriov_set_guest_vlan_mode(struct qlcnic_adapter *adapter, dev_info(&adapter->pdev->dev, "Number of allowed Guest VLANs = %d\n", sriov->num_allowed_vlans); - qlcnic_sriov_alloc_vlans(adapter); + ret = qlcnic_sriov_alloc_vlans(adapter); + if (ret) + return ret; if (!sriov->any_vlan) return 0; @@ -2164,7 +2166,7 @@ static int qlcnic_sriov_vf_resume(struct qlcnic_adapter *adapter) return err; } -void qlcnic_sriov_alloc_vlans(struct qlcnic_adapter *adapter) +int qlcnic_sriov_alloc_vlans(struct qlcnic_adapter *adapter) { struct qlcnic_sriov *sriov = adapter->ahw->sriov; struct qlcnic_vf_info *vf; @@ -2174,7 +2176,11 @@ void qlcnic_sriov_alloc_vlans(struct qlcnic_adapter *adapter) vf = &sriov->vf_info[i]; vf->sriov_vlans = kcalloc(sriov->num_allowed_vlans, sizeof(*vf->sriov_vlans), GFP_KERNEL); + if (!vf->sriov_vlans) + return -ENOMEM; } + + return 0; } void qlcnic_sriov_free_vlans(struct qlcnic_adapter *adapter) diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c index 50eaafa3eaba3..c9f2cd2462230 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c @@ -598,7 +598,9 @@ static int __qlcnic_pci_sriov_enable(struct qlcnic_adapter *adapter, if (err) goto del_flr_queue; - qlcnic_sriov_alloc_vlans(adapter); + err = qlcnic_sriov_alloc_vlans(adapter); + if (err) + goto del_flr_queue; return err;