linux-kernel - Re: [PATCH] usb: phy: msm: fix a possible NULL dereference

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Date:	Mon, 16 Nov 2015 13:23:01 -0600
From:	Felipe Balbi <balbi@...com>
To:	Corentin LABBE <clabbe.montjoie@...il.com>
CC:	<gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH] usb: phy: msm: fix a possible NULL dereference


Hi,

(you need to break your lines at 80 characters)

Corentin LABBE <clabbe.montjoie@...il.com> writes:
> Le 16/11/2015 18:07, Felipe Balbi a écrit :
>> 
>> Hi,
>> 
>> LABBE Corentin <clabbe.montjoie@...il.com> writes:
>>> of_match_device could return NULL, and so cause a NULL pointer
>>> dereference later. Renaming id to of_id (like all others do) in the
>>> process.
>>>
>>> Reported-by: coverity (CID 1324133)
>>> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
>>> ---
>>>  drivers/usb/phy/phy-msm-usb.c | 9 ++++++---
>>>  1 file changed, 6 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
>>> index 80eb991..c4a66cf 100644
>>> --- a/drivers/usb/phy/phy-msm-usb.c
>>> +++ b/drivers/usb/phy/phy-msm-usb.c
>>> @@ -1506,20 +1506,23 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
>>>  {
>>>  	struct msm_otg_platform_data *pdata;
>>>  	struct extcon_dev *ext_id, *ext_vbus;
>>> -	const struct of_device_id *id;
>>> +	const struct of_device_id *of_id;
>> 
>> and why did you need to rename this variable ? Please resend without the
>> variable rename.
>> 
>
> I was renaming because all other drivers call it of_id, but I got hint
> from another thread to use of_device_get_match_data() which will
> permit to remove that variable, and still solve the issue.

for -rc we usually want the smallest patch needed to fix the issue. That
would be the two line if() condition. If converting to
of_device_get_match_data() is about the same (2 or 3 lines), then it
should be fine; but as a general rule of thumb: we don't fix and
cleanup/refactor on the same patch unless strictly necessary.

-- 
balbi

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