From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolas Dichtel Subject: Re: [PATCH 0/2] [BUG FIXES - 3.10.27] sit: More backports Date: Wed, 29 Jan 2014 12:04:05 +0100 Message-ID: <52E8E025.2060803@6wind.com> References: <20140128205756.074448668@goodmis.org> Reply-To: nicolas.dichtel@6wind.com Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: stable , Clark Williams , "Luis Claudio R. Goncalves" , John Kacur To: Steven Rostedt , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Return-path: In-Reply-To: <20140128205756.074448668@goodmis.org> Sender: stable-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Le 28/01/2014 21:57, Steven Rostedt a =C3=A9crit : > At Red Hat we base our real-time kernel off of 3.10.27 and do lots of > stress testing on that kernel. This has discovered some bugs that we > can hit with the vanilla 3.10.27 kernel (no -rt patches applied). > > I sent out a bug fix that can cause a crash with the current 3.10.27 > when you add and then remove the sit module. That patch is obsoleted = by > these patches, as that patch was not enough. Can you explain a bit more which problem remains after that patch? I wonder if a problem remains also with ip6_tunnel.ko (net/ipv6/ip6_tun= nel.c), the same problem was spotted into this module. > > A previous patch that was backported: > > Upstream commit 205983c43700ac3a81e7625273a3fa83cd2759b5 > sit: allow to use rtnl ops on fb tunnel > > Had a depenency on commit 5e6700b3bf98 ("sit: add support of x-netns"= ) > which was not backported. The dependency was only on part of that > commit which is what I backported. I cannot comment directly the patch, it was an attachement, hence I put= my comments here. In patch 0001-sit-Unregister-sit-devices-with-rtnl_link_ops.patch, I wo= nder how 'if (dev_net(t->dev) !=3D net)' can be wrong. If commit 5e6700b3bf98 ("= sit: add support of x-netns") has not been backported, this test is always true. > > The other upstream commit 9434266f2c645d4fcf62a03a8e36ad8075e37943 > sit: fix use after free of fb_tunnel_dev > > fixes another bug we encountered, it also fixes the 3.10.27 bug > where removing the sit module cause the crash. This is the patch > that obsoletes my previous patch. > > -- Steve > > > Steven Rostedt (Red Hat) (1): > sit: Unregister sit devices with rtnl_link_ops > > Willem de Bruijn (1): > sit: fix use after free of fb_tunnel_dev > > ---- > net/ipv6/sit.c | 30 +++++++++++++++++++++++++----- > 1 file changed, 25 insertions(+), 5 deletions(-) >