Patrick McHardy
abbaccda4c
[NETFILTER]: ip_conntrack: fix invalid conntrack statistics RCU assumption
...
CONNTRACK_STAT_INC assumes rcu_read_lock in nf_hook_slow disables
preemption as well, making it legal to use __get_cpu_var without
disabling preemption manually. The assumption is not correct anymore
with preemptable RCU, additionally we need to protect against softirqs
when not holding ip_conntrack_lock.
Add CONNTRACK_STAT_INC_ATOMIC macro, which disables local softirqs,
and use where necessary.
Signed-off-by: Patrick McHardy <kaber@trash.net >
Signed-off-by: David S. Miller <davem@davemloft.net >
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