netdev - [PATCHv3 net 0/2] net: fixes for device unregistration

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Message-Id: <1436425150-5612-1-git-send-email-ja@ssi.bg>
Date:	Thu,  9 Jul 2015 09:59:08 +0300
From:	Julian Anastasov <ja@....bg>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	"Vittorio G (VittGam)" <linuxbugs@...tgam.net>
Subject: [PATCHv3 net 0/2] net: fixes for device unregistration

Test script from Eric W. Biederman can catch a problem
where packets from backlog are processed long after the last
synchronize_net call. This can be reproduced after few tests
if commit 381c759d9916 ("ipv4: Avoid crashing in ip_error")
is reverted for the test. Incoming packets do not hold
reference to device but even if they do, subsystems do not
expect packets to fly during and after the NETDEV_UNREGISTER
event.

The first fix has the cost of netif_running check in fast path.
The second fix calls rcu_read_lock while local IRQ is disabled,
I hope this is not against the rules.

Julian Anastasov (2):
  net: do not process device backlog during unregistration
  net: call rcu_read_lock early in process_backlog

 net/core/dev.c | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

-- 
1.9.3

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