From: David Miller <davem@davemloft.net>
To: gch981213@gmail.com
Cc: andrew@lunn.ch, f.fainelli@gmail.com, netdev@vger.kernel.org,
sean.wang@mediatek.com, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, opensource@vdorst.com,
rmk+kernel@armlinux.org.uk, linux-mediatek@lists.infradead.org,
matthias.bgg@gmail.com, vivien.didelot@gmail.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] net: dsa: mt7530: fix null pointer dereferencing in port5 setup
Date: Fri, 03 Apr 2020 16:11:39 -0700 (PDT) [thread overview]
Message-ID: <20200403.161139.2115986079787627095.davem@davemloft.net> (raw)
In-Reply-To: <20200403112830.505720-1-gch981213@gmail.com>
From: Chuanhong Guo <gch981213@gmail.com>
Date: Fri, 3 Apr 2020 19:28:24 +0800
> The 2nd gmac of mediatek soc ethernet may not be connected to a PHY
> and a phy-handle isn't always available.
> Unfortunately, mt7530 dsa driver assumes that the 2nd gmac is always
> connected to switch port 5 and setup mt7530 according to phy address
> of 2nd gmac node, causing null pointer dereferencing when phy-handle
> isn't defined in dts.
> This commit fix this setup code by checking return value of
> of_parse_phandle before using it.
>
> Fixes: 38f790a80560 ("net: dsa: mt7530: Add support for port 5")
> Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
> Cc: stable@vger.kernel.org
Please do not CC: stable for networking changes, as per:
Documentation/networking/netdev-FAQ.rstq
Applied and queued up for -stable, thank you.
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next prev parent reply other threads:[~2020-04-03 23:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-03 11:28 [PATCH] net: dsa: mt7530: fix null pointer dereferencing in port5 setup Chuanhong Guo
2020-04-03 17:03 ` Vivien Didelot
2020-04-03 17:43 ` Florian Fainelli
2020-04-03 18:09 ` René van Dorst
2020-04-04 3:19 ` Chuanhong Guo
2020-04-04 15:08 ` Andrew Lunn
2020-04-04 15:34 ` Chuanhong Guo
2020-04-03 23:11 ` David Miller [this message]
2020-04-04 3:37 ` Chuanhong Guo
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