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With commit d6ddef9e641d(IPv6: Fix not join all-router mcast group
when forwarding set.) I check 'dev' after it's dereference that
leads to a Smatch complaint:
net/ipv6/addrconf.c:438 ipv6_add_dev()
warn: variable dereferenced before check 'dev' (see line 432)
net/ipv6/addrconf.c
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
^^^^^^^^^^^^
Old dereference.
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 /* Join all-router multicast group if forwarding is set
*/
438 if (ndev->cnf.forwarding && dev && (dev->flags &
IFF_MULTICAST))
^^^
Remove the check to avoid the complaint as 'dev' can't be NULL.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8b2aaedee4