netdev - Re: [PATCH] net: fec: ptp: fix NULL pointer dereference if ptp

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Message-Id: <20141022.174841.909151462884445312.davem@davemloft.net>
Date:	Wed, 22 Oct 2014 17:48:41 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	p.zabel@...gutronix.de
Cc:	b45643@...escale.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: fec: ptp: fix NULL pointer dereference if
 ptp_clock is not set

From: Philipp Zabel <p.zabel@...gutronix.de>
Date: Wed, 22 Oct 2014 16:34:35 +0200

> Since commit 278d24047891 (net: fec: ptp: Enable PPS output based on ptp clock)
> fec_enet_interrupt calls fec_ptp_check_pps_event unconditionally, which calls
> into ptp_clock_event. If fep->ptp_clock is NULL, ptp_clock_event tries to
> dereference the NULL pointer.
> Since on i.MX53 fep->bufdesc_ex is not set, fec_ptp_init is never called,
> and fep->ptp_clock is NULL, which reliably causes a kernel panic.
> 
> This patch adds a check for fep->ptp_clock == NULL in fec_enet_interrupt.
> 
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>

Applied, thank you.
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