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i40e: define proper net_device::neigh_priv_len

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Out of bound read reported by KASan.

i40iw_net_event() reads unconditionally 16 bytes from
neigh->primary_key while the memory allocated for
"neighbour" struct is evaluated in neigh_alloc() as

  tbl->entry_size + dev->neigh_priv_len

where "dev" is a net_device.

But the driver does not setup dev->neigh_priv_len and
we read beyond the neigh entry allocated memory,
so the patch in the next mail fixes this.

Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Konstantin Khorenko 2018-11-23 19:10:28 +03:00 committed by Jeff Kirsher
parent cd0d465bb6
commit 31389b53b3
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/intel/i40e/i40e_main.c
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@ -12339,6 +12339,9 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
ether_addr_copy(netdev->dev_addr, mac_addr);
ether_addr_copy(netdev->perm_addr, mac_addr);
/* i40iw_net_event() reads 16 bytes from neigh->primary_key */
netdev->neigh_priv_len = sizeof(u32) * 4;
netdev->priv_flags |= IFF_UNICAST_FLT;
netdev->priv_flags |= IFF_SUPP_NOFCS;
/* Setup netdev TC information */