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netdev: remove potentially harmful checks 

Currently we're checking a variable for != NULL after actually
dereferencing it, in netdev_lower_get_next_private*().

It's counter-intuitive at best, and can lead to faulty usage (as it implies
that the variable can be NULL), so fix it by removing the useless checks.

Reported-by: Daniel Borkmann <dborkman@redhat.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Nicolas Dichtel <nicolas.dichtel@6wind.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: stephen hemminger <stephen@networkplumber.org>
CC: Jerry Chu <hkchu@google.com>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Veaceslav Falico 2014-04-07 11:25:12 +02:00 committed by David S. Miller
parent 6f25cd47dc
commit 6859e7df6d
1 changed files with 2 additions and 4 deletions
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6
net/core/dev.c
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@ -4589,8 +4589,7 @@ void *netdev_lower_get_next_private(struct net_device *dev,
if (&lower->list == &dev->adj_list.lower)
return NULL;
if (iter)
*iter = lower->list.next;
*iter = lower->list.next;
return lower->private;
}
@ -4618,8 +4617,7 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev,
if (&lower->list == &dev->adj_list.lower)
return NULL;
if (iter)
*iter = &lower->list;
*iter = &lower->list;
return lower->private;
}