Re: [netfilter-core] Re: [lockup] 2.6.17-rc3: netfilter/sctp: lockup in sctp_new(), do_basic_checks()

Ingo Molnar
2006-05-02T14:37:19Z

* Ingo Molnar <mingo@elte.hu> wrote:

> > How about this patch (based on your patch, but typos fixed and also
> > covers nf_conntrack)?
>
> sure, fine with me!

find updated patch below - quilt complained about 3 cases of
whitespace-at-end-of-line. (btw., this file at quite a distance from
proper Documentation/CodingStyle.)

Ingo

Index: linux/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
===================================================================
--- linux.orig/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
+++ linux/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
@@ -235,12 +235,15 @@ static int do_basic_checks(struct ip_con
flag = 1;
}

- /* Cookie Ack/Echo chunks not the first OR
- Init / Init Ack / Shutdown compl chunks not the only chunks */
- if ((sch->type == SCTP_CID_COOKIE_ACK
+ /*
+ * Cookie Ack/Echo chunks not the first OR
+ * Init / Init Ack / Shutdown compl chunks not the only chunks
+ * OR zero-length.
+ */
+ if (((sch->type == SCTP_CID_COOKIE_ACK
|| sch->type == SCTP_CID_COOKIE_ECHO
|| flag)
- && count !=0 ) {
+ && count !=0) || !sch->length) {
DEBUGP("Basic checks failed\n");
return 1;
}
Index: linux/net/netfilter/nf_conntrack_proto_sctp.c
===================================================================
--- linux.orig/net/netfilter/nf_conntrack_proto_sctp.c
+++ linux/net/netfilter/nf_conntrack_proto_sctp.c
@@ -240,12 +240,15 @@ static int do_basic_checks(struct nf_con
flag = 1;
}

- /* Cookie Ack/Echo chunks not the first OR
- Init / Init Ack / Shutdown compl chunks not the only chunks */
- if ((sch->type == SCTP_CID_COOKIE_ACK
+ /*
+ * Cookie Ack/Echo chunks not the first OR
+ * Init / Init Ack / Shutdown compl chunks not the only chunks
+ * OR zero-length.
+ */
+ if (((sch->type == SCTP_CID_COOKIE_ACK
|| sch->type == SCTP_CID_COOKIE_ECHO
|| flag)
- && count !=0 ) {
+ && count !=0) || !sch->length) {
DEBUGP("Basic checks failed\n");
return 1;
}