netdev - RE: [PATCH]: tipc: Fix oops on send prior to entering networked mode

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Date:	Tue, 23 Feb 2010 08:21:25 -0800
From:	"Stephens, Allan" <allan.stephens@...driver.com>
To:	"Neil Horman" <nhorman@...driver.com>
Cc:	<netdev@...r.kernel.org>, <jon.maloy@...csson.com>,
	<tipc-discussion@...ts.sourceforge.net>, <davem@...emloft.net>
Subject: RE: [PATCH]: tipc: Fix oops on send prior to entering networked mode

Neil wrote: 

> I agree that you patch fixes the exact problem that I 
> reported here, but theres more to it than that.  A quick grep 
> of the tipc stack reveals the following
> symbols:
> tipc_bearers
> media_list
> tipc_local_nodes
> bcbearer
> bclink
> tipc_net.zones
> 
> All of these symbols:
> 
> 1) Are allocated dynamically in tipc_net_start, _after_ 
> tipc_mode is set to TIPC_NET_MODE
> 
> 2) dereferenced without NULL pointer checks in either the 
> send path or in the netlink configuration path, both of which 
> are reachable from user space.
> 
> So your patch fixes the last item on your list, but what 
> about the others?  In fact, I'll bet I can very quickly 
> change the application to trip over a null tipc_local_nodes 
> dereference by changing the destination address to be 
> something within zone 0, cluster 0.

The semantics of TIPC addressing don't allow a node address of the form
<0.0.N> where N != 0, so this kind of a send ateempt should be caught
and handled by TIPC.  However, you've already found one missing error
check, so it's certainly worth trying it out!

Regards,
Al
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