netdev - Re: [PATCH] IB/mlx5: add checking for "vf" from do

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Date:   Wed, 24 Apr 2019 17:08:20 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Parav Pandit <parav@...lanox.com>, netdev@...r.kernel.org
Cc:     Leon Romanovsky <leon@...nel.org>, Eli Cohen <eli@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] IB/mlx5: add checking for "vf" from do_setvfinfo()

I think I'm just going to ask netdev for an opinion on this.  It could
be that we're just reading the code wrong...

I'm getting a lot of Smatch warning about buffer underflows.  The
problem is that Smatch marks everything from nla_data() as unknown and
untrusted user data.  In do_setvfinfo() we get the "->vf" values from
nla_data().  It starts as u32, but all the function pointers in
net_device_ops use it as a signed integer.  Most of the functions return
-EINVAL if "vf" is negative but there are at least 48 which potentially
use negative values as an offset into an array.

To me making "vf" a u32 throughout seems like a good idea but it's an
extensive patch and I'm not really able to test it at all.  But maybe
there is a better place to check for negatives.  Or maybe we are already
checking for negatives and I haven't seen it.  (I don't know this code
very well at all).

regards,
dan carpenter

drivers/net/ethernet/emulex/benet/be_main.c:1955 be_clear_vf_tvt() error: buffer underflow 'adapter->vf_cfg' 's32min-65534'
drivers/net/ethernet/emulex/benet/be_main.c:1904 be_get_vf_config() error: buffer underflow 'adapter->vf_cfg' 's32min-s32max'
drivers/net/ethernet/emulex/benet/be_main.c:2095 be_set_vf_link_state() error: buffer underflow 'adapter->vf_cfg' 's32min-65534'
drivers/net/ethernet/emulex/benet/be_main.c:1863 be_set_vf_mac() error: buffer underflow 'adapter->vf_cfg' 's32min-s32max'
drivers/net/ethernet/emulex/benet/be_main.c:2103 be_set_vf_spoofchk() error: buffer underflow 'adapter->vf_cfg' 's32min-s32max'
drivers/net/ethernet/emulex/benet/be_main.c:1926 be_set_vf_tvt() error: buffer underflow 'adapter->vf_cfg' 's32min-65534'
drivers/net/ethernet/emulex/benet/be_main.c:2067 be_set_vf_tx_rate() error: buffer underflow 'adapter->vf_cfg' 's32min-65534'
drivers/net/ethernet/emulex/benet/be_main.c:1984 be_set_vf_vlan() error: buffer underflow 'adapter->vf_cfg' 's32min-s32max'
drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c:2281 bnx2x_post_vf_bulletin() error: buffer underflow 'bp->vfdb->vfs' 's32min-63'
drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c:1523 bnx2x_set_vf_link_state() error: buffer underflow 'bp->vfdb->vfs' 's32min-s32max'
drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c:2963 bnx2x_set_vf_spoofchk() error: buffer underflow 'bp->vfdb->vfs' 's32min-s32max'
drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c:2589 bnx2x_vf_op_prep() error: buffer underflow 'bp->vfdb->vfs' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:202 bnxt_get_vf_config() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:309 bnxt_set_vf_bw() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:349 bnxt_set_vf_link_state() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:244 bnxt_set_vf_mac() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:96 bnxt_set_vf_spoofchk() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:180 bnxt_set_vf_trust() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:280 bnxt_set_vf_vlan() error: buffer underflow 'bp->pf.vf' 's32min-65534'
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2736 cxgb4_mgmt_get_vf_config() error: buffer underflow 'adap->vfinfo' 's32min-254'
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2923 cxgb4_mgmt_set_vf_link_state() error: buffer underflow 'adap->vfinfo' 's32min-254'
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2723 cxgb4_mgmt_set_vf_mac() error: buffer underflow 'adap->vfinfo' 's32min-s32max'
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2797 cxgb4_mgmt_set_vf_rate() error: buffer underflow 'adap->vfinfo' 's32min-254'
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2875 cxgb4_mgmt_set_vf_vlan() error: buffer underflow 'adap->vfinfo' 's32min-254'
drivers/net/ethernet/freescale/enetc/enetc_pf.c:377 enetc_pf_set_vf_mac() error: buffer underflow 'pf->vf_state' 's32min-2147483646'
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:7069 hclge_set_vf_vlan_filter() error: buffer underflow 'hdev->vport' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4223 i40e_ndo_get_vf_config() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4177 i40e_ndo_set_vf_bw() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4287 i40e_ndo_set_vf_link_state() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:3895 i40e_ndo_set_vf_mac() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4041 i40e_ndo_set_vf_port_vlan() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4357 i40e_ndo_set_vf_spoofchk() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4420 i40e_ndo_set_vf_trust() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:3862 i40e_validate_vf() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c:2678 ice_get_vf_cfg() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c:2879 ice_set_vf_link_state() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c:2792 ice_set_vf_mac() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c:2246 ice_set_vf_port_vlan() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c:2731 ice_set_vf_spoofchk() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c:2839 ice_set_vf_trust() error: buffer underflow 'pf->vf' 's32min-2147483646'
drivers/infiniband/hw/mlx5/ib_virt.c:114 mlx5_ib_set_vf_link_state() error: buffer underflow 'vfs_ctx' 's32min-s32max'
drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c:2005 qlcnic_sriov_get_vf_config() error: buffer underflow 'sriov->vf_info' 's32min-254'
drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c:1832 qlcnic_sriov_set_vf_mac() error: buffer underflow 'sriov->vf_info' 's32min-254'
drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c:2036 qlcnic_sriov_set_vf_spoofchk() error: buffer underflow 'sriov->vf_info' 's32min-254'
drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c:1864 qlcnic_sriov_set_vf_tx_rate() error: buffer underflow 'sriov->vf_info' 's32min-254'
drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c:1937 qlcnic_sriov_set_vf_vlan() error: buffer underflow 'sriov->vf_info' 's32min-254'