linux-kernel - Re: [PATCH 15/16] of: unittest: initialize args before calling of_irq_parse

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Date:   Fri, 5 Oct 2018 12:05:17 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alan Tull <atull@...nel.org>, Moritz Fischer <mdf@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-fpga@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH 15/16] of: unittest: initialize args before calling
 of_irq_parse_one()

On 10/05/18 06:26, Guenter Roeck wrote:
> On 10/04/2018 09:12 PM, frowand.list@...il.com wrote:
>> From: Frank Rowand <frank.rowand@...y.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@...ck-us.net>
>> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> 
> Reviewed-by: Guenter Roeck <linux@...ck-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 */
>>
> 
>