From: James Chapman <>
Date: Mon, 12 Feb 2018 17:33:23 +0000

> This patch series addresses several races with L2TP APIs discovered by
> syzbot. While working on this, it became clear that the L2TP code
> needed some work to address object lifetime issues. There are no
> functional changes.
> The set of patches 1-13 in combination fix the following syzbot reports.
> 9df43faf0 KASAN: use-after-free Read in pppol2tp_connect
> 6e6a5ec8d general protection fault in pppol2tp_connect
> 347bd5acd KASAN: use-after-free Read in inet_shutdown
> 19c09769f WARNING in debug_print_object

Some symbol export issues:

ERROR: "l2tp_tunnel_free" [net/l2tp/l2tp_ppp.ko] undefined!
ERROR: "l2tp_tunnel_free" [net/l2tp/l2tp_netlink.ko] undefined!
make[1]: *** [scripts/Makefile.modpost:92: __modpost] Error 1

Also, this series is also a hodge-podge of bug fixes that really belong
in 'net' alongside cleanups and refactoring that belong in 'net-next'.

Can you please pull out the genuine bug fixes into a smaller series
targetting 'net' and then after you fix the symbol export issues
we can build on top of that in net-next with the cleanups and

Thank you.

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