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

From: Felipe Balbi
Date: Mon Nov 16 2015 - 14:23:13 EST



Hi,

(you need to break your lines at 80 characters)

Corentin LABBE <clabbe.montjoie@xxxxxxxxx> writes:
> Le 16/11/2015 18:07, Felipe Balbi a Ãcrit :
>>
>> Hi,
>>
>> LABBE Corentin <clabbe.montjoie@xxxxxxxxx> 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@xxxxxxxxx>
>>> ---
>>> 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

Attachment: signature.asc
Description: PGP signature