tree b9c24c76cd94e120384471be19e0d1bf8522b9ce
parent 6539c4f991c28e82d1eb0385d35cc9662985f61a
author Guillaume Nault <g.nault@alphalink.fr> 1490958146 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1499258418 +0200

l2tp: ensure session can't get removed during pppol2tp_session_ioctl()

commit 57377d63547861919ee634b845c7caa38de4a452 upstream.

Holding a reference on session is required before calling
pppol2tp_session_ioctl(). The session could get freed while processing the
ioctl otherwise. Since pppol2tp_session_ioctl() uses the session's socket,
we also need to take a reference on it in l2tp_session_get().

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>