tree 58e28cc25db59456092fc760b7a29e6d223610c5
parent 923f4902fefdf4e89b0fb32c4e069d4f57d704f5
author Patrick McHardy <kaber@trash.net> 1171307594 -0800
committer David S. Miller <davem@davemloft.net> 1171307594 -0800

[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>