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net: set fib rule refcount after malloc

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The configure callback of fib_rules_ops can change the refcnt of a
fib rule. For instance, mlxsw takes a refcnt when adding the processing
of the rule to a work queue. Thus the rule refcnt can not be reset to
to 1 afterwards. Move the refcnt setting to after the allocation.

Fixes: 5361e209dd ("net: avoid one splat in fib_nl_delrule()")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2017-07-13 13:36:40 -07:00 committed by David S. Miller
parent 2683701201
commit 5d89fb3322
1 changed files with 1 additions and 2 deletions
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3
net/core/fib_rules.c
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@ -400,6 +400,7 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
err = -ENOMEM;
goto errout;
}
refcount_set(&rule->refcnt, 1);
rule->fr_net = net;
rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
@ -517,8 +518,6 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
last = r;
}
refcount_set(&rule->refcnt, 1);
if (last)
list_add_rcu(&rule->list, &last->list);
else