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ipv4: fix a race in update_or_create_fnhe()

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nh_exceptions is effectively used under rcu, but lacks proper
barriers. Between kzalloc() and setting of nh->nh_exceptions(),
we need a proper memory barrier.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 4895c771c7 ("ipv4: Add FIB nexthop exceptions.")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2014-09-03 22:21:56 -07:00
committed by David S. Miller
parent 29abe2fda5
commit caa415270c
3 changed files with 9 additions and 7 deletions
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2
include/net/ip_fib.h
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@@ -87,7 +87,7 @@ struct fib_nh {
int nh_saddr_genid;
struct rtable __rcu * __percpu *nh_pcpu_rth_output;
struct rtable __rcu *nh_rth_input;
struct fnhe_hash_bucket *nh_exceptions;
struct fnhe_hash_bucket __rcu *nh_exceptions;
};
/*