netdev - [net-next 03/14] i40evf: fix mac filter removal timing issue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20171009223841.2557-4-jeffrey.t.kirsher@intel.com>
Date:   Mon,  9 Oct 2017 15:38:30 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Alan Brady <alan.brady@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 03/14] i40evf: fix mac filter removal timing issue

From: Alan Brady <alan.brady@...el.com>

Due to the asynchronous nature in which mac filters are added and
deleted, there exists a bug in which filters are erroneously removed if
removed then added again quickly.

The events are as such:
    - filter marked for removal
    - same filter is re-added before watchdog that cleans up filters
    - we skip re-adding the filter because we have it already in the
list
    - watchdog filter cleanup kicks off and filter is removed

So when we were re-adding the same filter, it didn't actually get added
because it already existed in the list, but was marked for removal and
had yet to actually be removed.

This patch fixes the issue by making sure that when adding a filter, if
we find it already existing in our list, make sure it is not marked to
be removed.

Signed-off-by: Alan Brady <alan.brady@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40evf/i40evf_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 1d2fc898b664..f62d9565c7b5 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -880,6 +880,8 @@ i40evf_mac_filter *i40evf_add_filter(struct i40evf_adapter *adapter,
 		list_add_tail(&f->list, &adapter->mac_filter_list);
 		f->add = true;
 		adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
+	} else {
+		f->remove = false;
 	}
 
 	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
-- 
2.14.2