From: Li Wei <lw@cn•fujitsu.com>
To: "David S. Miller" <davem@davemloft•net>
Cc: Dan Carpenter <dan.carpenter@oracle•com>,
netdev <netdev@vger•kernel.org>
Subject: [PATCH] IPv6: Fix Smatch warning.
Date: Thu, 08 Mar 2012 08:58:07 +0800 [thread overview]
Message-ID: <4F58041F.5060209@cn.fujitsu.com> (raw)
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>
---
net/ipv6/addrconf.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6b8ebc5..6a3bb60 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -435,7 +435,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
/* Join all-router multicast group if forwarding is set */
- if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
+ if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
return ndev;
--
1.7.1
next reply other threads:[~2012-03-08 1:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-08 0:58 Li Wei [this message]
2012-03-11 22:57 ` [PATCH] IPv6: Fix Smatch warning David Miller
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