netfilter: ipt_CLUSTERIP: fix a refcount bug in clusterip_config_find_get()

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In clusterip_config_find_get() we hold RCU read lock so it could
run concurrently with clusterip_config_entry_put(), as a result,
the refcnt could go back to 1 from 0, which leads to a double
list_del()... Just replace refcount_inc() with
refcount_inc_not_zero(), as for c->refcount.

Fixes: d73f33b168 ("netfilter: CLUSTERIP: RCU conversion")
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Cong Wang 2018-02-08 13:53:52 -08:00 • committed by Pablo Neira Ayuso

parent 57ebd808a9

commit db93a3632b

1 changed files with 6 additions and 2 deletions

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net/ipv4/netfilter/ipt_CLUSTERIP.c

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