From: Pablo Neira Ayuso Date: Wed, 9 Nov 2005 20:59:41 +0000 (-0800) Subject: [NETFILTER] ctnetlink: check if protoinfo is present X-Git-Tag: v2.6.15-rc1~60^2~14 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51df784ed739246a3774b300e5f536e17bec36ed;p=linux-2.6 [NETFILTER] ctnetlink: check if protoinfo is present This fixes an oops triggered from userspace. If we don't pass information about the private protocol info, the reference to attr will be NULL. This is likely to happen in update messages. Signed-off-by: Pablo Neira Ayuso Signed-off-by: Harald Welte Signed-off-by: David S. Miller --- diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c index 6ea4b22ff2..468c6003b4 100644 --- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c +++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c @@ -362,6 +362,11 @@ static int nfattr_to_tcp(struct nfattr *cda[], struct ip_conntrack *ct) struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1]; struct nfattr *tb[CTA_PROTOINFO_TCP_MAX]; + /* updates could not contain anything about the private + * protocol info, in that case skip the parsing */ + if (!attr) + return 0; + nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr); if (!tb[CTA_PROTOINFO_TCP_STATE-1])