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netfilter: nf_ct_sip: extend RCU read lock in set_expected_rtp_rtcp()

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Currently set_expected_rtp_rtcp() in the SIP helper uses
rcu_dereference() two times to access two different NAT hook
functions. However, only the first one is protected by the RCU
reader lock, but the 2nd isn't. Fix it by extending the RCU
protected area.

This is more a cosmetic thing since we rely on all netfilter hooks
being rcu_read_lock()ed by nf_hook_slow() in many places anyways,
as Patrick McHardy clarified.

Signed-off-by: Holger Eitzenberger <holger.eitzenberger@sophos.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
holger@eitzenberger.org 2013-09-20 22:43:04 +02:00 committed by Pablo Neira Ayuso
parent 8ce4406103
commit b21613aeb6
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/nf_conntrack_sip.c
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@ -966,7 +966,6 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
#endif
skip_expect = 1;
} while (!skip_expect);
rcu_read_unlock();
base_port = ntohs(tuple.dst.u.udp.port) & ~1;
rtp_port = htons(base_port);
@ -980,8 +979,10 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
goto err1;
}
if (skip_expect)
if (skip_expect) {
rcu_read_unlock();
return NF_ACCEPT;
}
rtp_exp = nf_ct_expect_alloc(ct);
if (rtp_exp == NULL)
@ -1012,6 +1013,7 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
err2:
nf_ct_expect_put(rtp_exp);
err1:
rcu_read_unlock();
return ret;
}