netdev - [PATCH net] net: dcb: disable softirqs in dcbnl_flush

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Message-Id: <20220302193939.1368823-1-vladimir.oltean@nxp.com>
Date:   Wed,  2 Mar 2022 21:39:39 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Petr Machata <petrm@...dia.com>,
        Ido Schimmel <idosch@...dia.com>,
        Ido Schimmel <idosch@...sch.org>
Subject: [PATCH net] net: dcb: disable softirqs in dcbnl_flush_dev()

Ido Schimmel points out that since commit 52cff74eef5d ("dcbnl : Disable
software interrupts before taking dcb_lock"), the DCB API can be called
by drivers from softirq context.

One such in-tree example is the chelsio cxgb4 driver:
dcb_rpl
-> cxgb4_dcb_handle_fw_update
   -> dcb_ieee_setapp

If the firmware for this driver happened to send an event which resulted
in a call to dcb_ieee_setapp() at the exact same time as another
DCB-enabled interface was unregistering on the same CPU, the softirq
would deadlock, because the interrupted process was already holding the
dcb_lock in dcbnl_flush_dev().

Fix this unlikely event by using spin_lock_bh() in dcbnl_flush_dev() as
in the rest of the dcbnl code.

Fixes: 91b0383fef06 ("net: dcb: flush lingering app table entries for unregistered devices")
Reported-by: Ido Schimmel <idosch@...sch.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dcb/dcbnl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 36c91273daac..dc4fb699b56c 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -2077,7 +2077,7 @@ static void dcbnl_flush_dev(struct net_device *dev)
 {
 	struct dcb_app_type *itr, *tmp;
 
-	spin_lock(&dcb_lock);
+	spin_lock_bh(&dcb_lock);
 
 	list_for_each_entry_safe(itr, tmp, &dcb_app_list, list) {
 		if (itr->ifindex == dev->ifindex) {
@@ -2086,7 +2086,7 @@ static void dcbnl_flush_dev(struct net_device *dev)
 		}
 	}
 
-	spin_unlock(&dcb_lock);
+	spin_unlock_bh(&dcb_lock);
 }
 
 static int dcbnl_netdevice_event(struct notifier_block *nb,
-- 
2.25.1