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ipv4: Add a missing rcu_assign_pointer() in routing cache.

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rt_intern_hash() is doing an update of a RCU guarded hash chain
without using rcu_assign_pointer() or equivalent barrier.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-10-16 14:18:29 -07:00 committed by David S. Miller
parent dc976c09da
commit 00269b54ed
1 changed files with 6 additions and 1 deletions
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7
net/ipv4/route.c
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@ -1109,7 +1109,12 @@ static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp)
printk("\n");
}
#endif
rt_hash_table[hash].chain = rt;
/*
* Since lookup is lockfree, we must make sure
* previous writes to rt are comitted to memory
* before making rt visible to other CPUS.
*/
rcu_assign_pointer(rt_hash_table[hash].chain, rt);
spin_unlock_bh(rt_hash_lock_addr(hash));
*rp = rt;
return 0;