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ice: Fix KASAN error in LAG NETDEV_UNREGISTER handler 

Currently, the same handler is called for both a NETDEV_BONDING_INFO
LAG unlink notification as for a NETDEV_UNREGISTER call.  This is
causing a problem though, since the netdev_notifier_info passed has
a different structure depending on which event is passed.  The problem
manifests as a call trace from a BUG: KASAN stack-out-of-bounds error.

Fix this by creating a handler specific to NETDEV_UNREGISTER that only
is passed valid elements in the netdev_notifier_info struct for the
NETDEV_UNREGISTER event.

Also included is the removal of an unbalanced dev_put on the peer_netdev
and related braces.

Fixes: 6a8b357278 ("ice: Respond to a NETDEV_UNREGISTER event for LAG")
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Acked-by: Jonathan Toppins <jtoppins@redhat.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Dave Ertman 2022-01-18 13:08:20 -08:00 committed by Tony Nguyen
parent 46b699c50c
commit bea1898f65
1 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/net/ethernet/intel/ice/ice_lag.c
View File

@ -204,17 +204,39 @@ ice_lag_unlink(struct ice_lag *lag,
lag->upper_netdev = NULL;
}
if (lag->peer_netdev) {
dev_put(lag->peer_netdev);
lag->peer_netdev = NULL;
}
lag->peer_netdev = NULL;
ice_set_sriov_cap(pf);
ice_set_rdma_cap(pf);
lag->bonded = false;
lag->role = ICE_LAG_NONE;
}
/**
* ice_lag_unregister - handle netdev unregister events
* @lag: LAG info struct
* @netdev: netdev reporting the event
*/
static void ice_lag_unregister(struct ice_lag *lag, struct net_device *netdev)
{
struct ice_pf *pf = lag->pf;
/* check to see if this event is for this netdev
* check that we are in an aggregate
*/
if (netdev != lag->netdev || !lag->bonded)
return;
if (lag->upper_netdev) {
dev_put(lag->upper_netdev);
lag->upper_netdev = NULL;
ice_set_sriov_cap(pf);
ice_set_rdma_cap(pf);
}
/* perform some cleanup in case we come back */
lag->bonded = false;
lag->role = ICE_LAG_NONE;
}
/**
* ice_lag_changeupper_event - handle LAG changeupper event
* @lag: LAG info struct
@ -307,7 +329,7 @@ ice_lag_event_handler(struct notifier_block *notif_blk, unsigned long event,
ice_lag_info_event(lag, ptr);
break;
case NETDEV_UNREGISTER:
ice_lag_unlink(lag, ptr);
ice_lag_unregister(lag, netdev);
break;
default:
break;