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[NETFILTER]: H.323 helper: fix possible NULL-ptr dereference

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An RCF message containing a timeout results in a NULL-ptr dereference if
no RRQ has been seen before.

Noticed by the "SATURN tool", reported by Thomas Dillig <tdillig@stanford.edu>
and Isil Dillig <isil@stanford.edu>.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-07-24 22:52:10 -07:00 committed by David S. Miller
parent b4e54de8d3
commit 083edca05a
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/netfilter/ip_conntrack_helper_h323.c
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@ -1200,7 +1200,7 @@ static struct ip_conntrack_expect *find_expect(struct ip_conntrack *ct,
tuple.dst.protonum = IPPROTO_TCP;
exp = __ip_conntrack_expect_find(&tuple);
if (exp->master == ct)
if (exp && exp->master == ct)
return exp;
return NULL;
}