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authorWANG Cong <xiyou.wangcong@gmail.com>2016-07-05 22:12:36 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-06 11:16:17 +0100
commit7a2b4ee54b3f23668fa366a4b0e04d351f809bb0 (patch)
tree8d7d84a5a9abc7ec5bcaf89337917895247b9573 /Makefile
parent37de955c11b59050346e530143c20b10b4846527 (diff)
downloadlinux-linaro-stable-7a2b4ee54b3f23668fa366a4b0e04d351f809bb0.tar.gz
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> Cc: bmajal222 <bmajal222@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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