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H.323 helper: fix possible NULL-ptr dereference

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[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: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Patrick McHardy
2006-07-25 02:31:14 +02:00
committed by Greg Kroah-Hartman
parent 7e92c4788d
commit 4f40508af1
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/ipv4/netfilter/ip_conntrack_helper_h323.c
+1 -1
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@@ -1092,7 +1092,7 @@ 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;
}