Re: [PATCH 15/16] of: unittest: initialize args before calling of_irq_parse_one()

From: Frank Rowand <frowand.list@gmail.com>
To: Guenter Roeck <linux@roeck-us.net>,
	Rob Herring <robh+dt@kernel.org>,
	Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>, Alan Tull <atull@kernel.org>,
	Moritz Fischer <mdf@kernel.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	devicetree@vger.kernel.org, linux-fpga@vger.kernel.org,
	Frank Rowand <frowand.list@gmail.com>
Subject: Re: [PATCH 15/16] of: unittest: initialize args before calling of_irq_parse_one()
Date: Fri, 5 Oct 2018 12:05:17 -0700	[thread overview]
Message-ID: <3c6fe77f-5fe6-0289-9480-7c98cdf81a43@gmail.com> (raw)
In-Reply-To: <7fc4b9da-5fdf-11c9-e168-ccb2d960adea@roeck-us.net>

On 10/05/18 06:26, Guenter Roeck wrote:
> On 10/04/2018 09:12 PM, frowand.list@gmail.com wrote:
>> From: Frank Rowand <frank.rowand@sony.com>
>>
>> Callers of of_irq_parse_one() blindly use the pointer args.np
>> without checking whether of_irq_parse_one() had an error and
>> thus did not set the value of args.np.  Initialize args to
>> zero so that using the format "%pOF" to show the value of
>> args.np will show "(null)" when of_irq_parse_one() has an
>> error and does not set args.np instead of trying to
>> dereference a random value.
>>
>> Reported-by: Guenter Roeck <linux@roeck-us.net>
>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> 
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> 
> The same problem exists when of_parse_phandle_with_args() reports an error.

Thanks, I'll add a fix for that.

-Frank

> 
> Guenter
> 
>> ---
>>   drivers/of/unittest.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
>> index 6d80f474c8f2..b61a33f30a56 100644
>> --- a/drivers/of/unittest.c
>> +++ b/drivers/of/unittest.c
>> @@ -780,7 +780,7 @@ static void __init of_unittest_parse_interrupts(void)
>>       for (i = 0; i < 4; i++) {
>>           bool passed = true;
>>   -        args.args_count = 0;
>> +        memset(&args, 0, sizeof(args));
>>           rc = of_irq_parse_one(np, i, &args);
>>             passed &= !rc;
>> @@ -801,7 +801,7 @@ static void __init of_unittest_parse_interrupts(void)
>>       for (i = 0; i < 4; i++) {
>>           bool passed = true;
>>   -        args.args_count = 0;
>> +        memset(&args, 0, sizeof(args));
>>           rc = of_irq_parse_one(np, i, &args);
>>             /* Test the values from tests-phandle.dtsi */
>> @@ -854,6 +854,7 @@ static void __init of_unittest_parse_interrupts_extended(void)
>>       for (i = 0; i < 7; i++) {
>>           bool passed = true;
>>   +        memset(&args, 0, sizeof(args));
>>           rc = of_irq_parse_one(np, i, &args);
>>             /* Test the values from tests-phandle.dtsi */
>>
> 
> 