linux-kernel - [PATCH 3.16 72/83] net: Fix null de-reference of device refcount

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Message-ID: <lsq.1574264230.456932760@decadent.org.uk>
Date:   Wed, 20 Nov 2019 15:38:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Subash Abhinov Kasiviswanathan" <subashab@...eaurora.org>,
        "Sean Tranchetti" <stranche@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 72/83] net: Fix null de-reference of device refcount

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>

commit 10cc514f451a0f239aa34f91bc9dc954a9397840 upstream.

In event of failure during register_netdevice, free_netdev is
invoked immediately. free_netdev assumes that all the netdevice
refcounts have been dropped prior to it being called and as a
result frees and clears out the refcount pointer.

However, this is not necessarily true as some of the operations
in the NETDEV_UNREGISTER notifier handlers queue RCU callbacks for
invocation after a grace period. The IPv4 callback in_dev_rcu_put
tries to access the refcount after free_netdev is called which
leads to a null de-reference-

44837.761523:   <6> Unable to handle kernel paging request at
                    virtual address 0000004a88287000
44837.761651:   <2> pc : in_dev_finish_destroy+0x4c/0xc8
44837.761654:   <2> lr : in_dev_finish_destroy+0x2c/0xc8
44837.762393:   <2> Call trace:
44837.762398:   <2>  in_dev_finish_destroy+0x4c/0xc8
44837.762404:   <2>  in_dev_rcu_put+0x24/0x30
44837.762412:   <2>  rcu_nocb_kthread+0x43c/0x468
44837.762418:   <2>  kthread+0x118/0x128
44837.762424:   <2>  ret_from_fork+0x10/0x1c

Fix this by waiting for the completion of the call_rcu() in
case of register_netdevice errors.

Fixes: 93ee31f14f6f ("[NET]: Fix free_netdev on register_netdev failure.")
Cc: Sean Tranchetti <stranche@...eaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/core/dev.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6278,6 +6278,8 @@ int register_netdevice(struct net_device
 	ret = notifier_to_errno(ret);
 	if (ret) {
 		rollback_registered(dev);
+		rcu_barrier();
+
 		dev->reg_state = NETREG_UNREGISTERED;
 	}
 	/*