From: Sergei Shtylyov <sergei.shtylyov@cogentembedded•com>
To: Florian Fainelli <f.fainelli@gmail•com>, netdev@vger•kernel.org
Cc: arnd@arndb•de
Subject: Re: [PATCH] pxa168_eth: fix mdiobus_scan() error check
Date: Sun, 1 May 2016 23:30:06 +0300 [thread overview]
Message-ID: <5726674E.2030904@cogentembedded.com> (raw)
In-Reply-To: <57266638.6030704@cogentembedded.com>
On 05/01/2016 11:25 PM, Sergei Shtylyov wrote:
>>> Since mdiobus_scan() returns either an error code or NULL on error, the
>>> driver should check for both, not only for NULL, otherwise a crash is
>>> imminent...
>>>
>>> Reported-by: Arnd Bergmann <arnd@arndb•de>
>>> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded•com>
>>>
>>> ---
>>> The patch is against DaveM's 'net.git' repo.
>>>
>>> drivers/net/ethernet/marvell/pxa168_eth.c | 2 ++
>>> 1 file changed, 2 insertions(+)
>>>
>>> Index: net/drivers/net/ethernet/marvell/pxa168_eth.c
>>> ===================================================================
>>> --- net.orig/drivers/net/ethernet/marvell/pxa168_eth.c
>>> +++ net/drivers/net/ethernet/marvell/pxa168_eth.c
>>> @@ -979,6 +979,8 @@ static int pxa168_init_phy(struct net_de
>>> return 0;
>>>
>>> pep->phy = mdiobus_scan(pep->smi_bus, pep->phy_addr);
>>> + if (IS_ERR(pep->phy))
>>> + return PTR_ERR(pep->phy);
>>> if (!pep->phy)
>>> return -ENODEV;
>>
>> Should not this check be removed too and
>
> That's my next move -- for now I'm fixing the existing bug in this driver
> only.
In fact, it can't be removed yet as mdiobus_scan() may return NULL on
other error path. There's certainly a space for improvements yet...
[...]
MBR, Sergei
next prev parent reply other threads:[~2016-05-01 20:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-28 22:09 [PATCH RFT v2 0/2] Teach phylib hard-resetting devices Sergei Shtylyov
2016-04-28 22:15 ` [PATCH RFT v2 2/2] macb: kill PHY reset code Sergei Shtylyov
2016-04-29 9:36 ` Nicolas Ferre
2016-04-30 20:35 ` [PATCH] pxa168_eth: fix mdiobus_scan() error check Sergei Shtylyov
2016-05-01 16:05 ` Florian Fainelli
2016-05-01 20:25 ` Sergei Shtylyov
2016-05-01 20:30 ` Sergei Shtylyov [this message]
2016-05-03 19:03 ` David Miller
2016-05-07 19:53 ` [PATCH] pxa168_eth: mdiobus_scan() doesn't return NULL anymore Sergei Shtylyov
2016-05-09 4:14 ` David Miller
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