[NETFILTER]: H.323 helper: fix possible NULL-ptr dereference
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>
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@ -1200,7 +1200,7 @@ static struct ip_conntrack_expect *find_expect(struct ip_conntrack *ct,
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tuple.dst.protonum = IPPROTO_TCP;
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exp = __ip_conntrack_expect_find(&tuple);
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if (exp->master == ct)
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if (exp && exp->master == ct)
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return exp;
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return NULL;
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}
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