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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2016-07-05 22:12:36 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-11-20 01:16:47 +0000 |
| commit | 554ab54b84651317f90c3b40a38365ae9ad671d8 (patch) | |
| tree | 6053515d0f45af36049571ff5bc9c6210d6b7885 /include/linux/workqueue.h | |
| parent | 0e2a2e98feb03212642d876597a43abd5deda5bf (diff) | |
ppp: defer netns reference release for ppp channel
commit 205e1e255c479f3fd77446415706463b282f94e4 upstream.
Matt reported that we have a NULL pointer dereference
in ppp_pernet() from ppp_connect_channel(),
i.e. pch->chan_net is NULL.
This is due to that a parallel ppp_unregister_channel()
could happen while we are in ppp_connect_channel(), during
which pch->chan_net set to NULL. Since we need a reference
to net per channel, it makes sense to sync the refcnt
with the life time of the channel, therefore we should
release this reference when we destroy it.
Fixes: 1f461dcdd296 ("ppp: take reference on channels netns")
Reported-by: Matt Bennett <Matt.Bennett@alliedtelesis.co.nz>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linux-ppp@vger.kernel.org
Cc: Guillaume Nault <g.nault@alphalink.fr>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include/linux/workqueue.h')
0 files changed, 0 insertions, 0 deletions