linux-kernel - Re: [PATCH] Tty: serial - Fix possible NULL derefrence.

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Date:   Sat, 18 Feb 2017 11:25:19 +0100
From:   Maarten Brock <m.brock@...mierlo.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Shailendra Verma <shailendra.v@...sung.com>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, p.shailesh@...sung.com,
        ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.capricorn@...il.com>,
        linux-serial-owner@...r.kernel.org
Subject: Re: [PATCH] Tty: serial - Fix possible NULL derefrence.

Hello Greg,

Does that also mean that this isn't possible in the sc16is7xx.c driver 
in
sc16is7xx_spi_probe() line 1358 and sc16is7xx_i2c_probe() line 1419 ?

If so, should these checks be removed?

Kind regards,
Maarten

On 2017-01-30 20:37, Greg Kroah-Hartman wrote:
> On Fri, Jan 27, 2017 at 04:46:13PM +0530, Shailendra Verma wrote:
>> of_match_device could return NULL, and so can cause a NULL
>> pointer dereference later.
>> 
>> Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
>> ---
>>  drivers/tty/serial/max310x.c |    4 ++++
>>  1 file changed, 4 insertions(+)
>> 
>> diff --git a/drivers/tty/serial/max310x.c 
>> b/drivers/tty/serial/max310x.c
>> index 8a3e926..a94d147 100644
>> --- a/drivers/tty/serial/max310x.c
>> +++ b/drivers/tty/serial/max310x.c
>> @@ -1323,6 +1323,10 @@ static int max310x_spi_probe(struct spi_device 
>> *spi)
>>  	if (spi->dev.of_node) {
>>  		const struct of_device_id *of_id =
>>  			of_match_device(max310x_dt_ids, &spi->dev);
>> +		if (!of_id) {
>> +			dev_err(&spi->dev, "Error: No device match found\n");
>> +			return -ENODEV;
>> +		}
> 
> Patch now dropped as this isn't possible.
> 
> thanks,
> 
> greg k-h
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