From: Xie He <xie.he.0...@gmail.com> Date: Sun, 27 Dec 2020 18:53:39 -0800
> ppp_cp_event is called directly or indirectly by ppp_rx with "ppp->lock" > held. It may call mod_timer to add a new timer. However, at the same time > ppp_timer may be already running and waiting for "ppp->lock". In this > case, there's no need for ppp_timer to continue running and it can just > exit. > > If we let ppp_timer continue running, it may call add_timer. This causes > kernel panic because add_timer can't be called with a timer pending. > This patch fixes this problem. > > Fixes: e022c2f07ae5 ("WAN: new synchronous PPP implementation for generic > HDLC.") > Cc: Krzysztof Halasa <k...@pm.waw.pl> > Signed-off-by: Xie He <xie.he.0...@gmail.com> Applied and queued up for -stable, thanks!