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Date:   Mon, 28 Dec 2020 15:11:02 -0800 (PST)
From:   David Miller <>
Subject: Re: [PATCH net v2] net: hdlc_ppp: Fix issues when mod_timer is
 called while timer is running

From: Xie He <>
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 <>
> Signed-off-by: Xie He <>

Applied and queued up for -stable, thanks!

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