netdev - Re: [Patch] rose_route_frame() NULL pointer dereference kernel panic

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Message-ID: <56DC0D5B.1040408@free.fr>
Date:	Sun, 6 Mar 2016 11:58:35 +0100
From:	f6bvp <f6bvp@...e.fr>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	ralf@...ux-mips.org, "Eric W. Biederman\"" <ebiederm@...ssion.com>,
	linux-hams@...r.kernel.org, Bernard Pidoux <bernard.pidoux@...e.fr>
Subject: Re: [Patch] rose_route_frame() NULL pointer dereference kernel panic

François,

Thank you for providing information about rose_rebuild_header history.
I was not able to find Jonathan Naylor G4KLX email.
However as rose_xmit() has been recently changed by Eric Biederman, he
may have more precise information about rose_route_frame()
NULL argument.
Meanwhile, I browsed into rose_route.c release 001 you referenced and found
an interesting comment before rose_route_frame() :
+/*
+ * Route a frame to an appropriate AX.25 connection. A NULL ax25_cb
+ * indicates an internally generated frame.
+ */
+int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)

Now, I hope that ROSE guru will explain us what means an "internally
generated frame" and if, by chance, it means that it is not to be sent
via a net device, but rather to be used locally ?

Bernard