netdev - [PATCH net 0/2] l2tp: fix some races in session deletion

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Date:   Fri, 22 Sep 2017 15:39:22 +0200
From:   Guillaume Nault <g.nault@...halink.fr>
To:     netdev@...r.kernel.org
Cc:     James Chapman <jchapman@...alix.com>,
        Tom Parkin <tparkin@...alix.com>,
        Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net 0/2] l2tp: fix some races in session deletion

L2TP provides several interfaces for deleting sessions. Using two of
them concurrently can lead to use-after-free bugs.

Patch #2 uses a flag to prevent double removal of L2TP sessions.
Patch #1 fixes a bug found in the way. Fixing this bug is also
necessary for patch #2 to handle all cases.


This issue is similar to the tunnel deletion bug being worked on by
Sabrina: https://patchwork.ozlabs.org/patch/814173/

Guillaume Nault (2):
  l2tp: ensure sessions are freed after their PPPOL2TP socket
  l2tp: fix race between l2tp_session_delete() and
    l2tp_tunnel_closeall()

 net/l2tp/l2tp_core.c | 6 ++++++
 net/l2tp/l2tp_core.h | 1 +
 net/l2tp/l2tp_ppp.c  | 8 ++++----
 3 files changed, 11 insertions(+), 4 deletions(-)

-- 
2.14.1