ipv4: fix a race in update_or_create_fnhe()

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commit caa415270c upstream.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Eric Dumazet 2014-09-03 22:21:56 -07:00 • committed by Ben Hutchings

parent 142dcb1244

commit 73bbb7ec88

3 changed files with 9 additions and 7 deletions

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include/net/ip_fib.h

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