linux-kernel - Re: [PATCH] iio: test : check null return of kunit_kmalloc in iio_rescale_test

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Message-ID: <34ab4d22-0b07-43ba-9d4f-eb4b2867f36a@kylinos.cn>
Date: Mon, 4 Nov 2024 09:14:45 +0800
From: Pei Xiao <xiaopei01@...inos.cn>
To: Jonathan Cameron <jic23@...nel.org>
Cc: liambeguin@...il.com, lars@...afoo.de, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, xiaopeitux@...mail.com
Subject: Re: [PATCH] iio: test : check null return of kunit_kmalloc in
 iio_rescale_test_scale



On 2024/11/2 01:29, Jonathan Cameron Wrote:
> On Wed, 30 Oct 2024 11:48:54 +0800
> Pei Xiao <xiaopei01@...inos.cn> wrote:
> 
>> kunit_kmalloc may fail, return value might be NULL and will cause
>> NULL pointer dereference.Add KUNIT_ASSERT_NOT_ERR_OR_NULL fix it.
> Can it be an error?  If not why not use KUNIT_ASSERT_NOT_NULL?
As you thought, initially I felt that we should use 
KUNIT_ASSERT_NOT_NULL. However, when I used grep 
KUNIT_ASSERT_NOT_ERR_OR_NULL -nr drivers/iio/test/, I found that the 
drivers/iio/test/ directory exclusively uses 
KUNIT_ASSERT_NOT_ERR_OR_NULL instead of KUNIT_ASSERT_NOT_NULL. To 
maintain consistency, I have changed it to KUNIT_ASSERT_NOT_ERR_OR_NULL.

drivers/iio/test/iio-test-format.c:22: 
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
drivers/iio/test/iio-test-format.c:52: 
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
drivers/iio/test/iio-test-format.c:113: 
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
drivers/iio/test/iio-test-format.c:153: 
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
drivers/iio/test/iio-test-format.c:193: 
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
drivers/iio/test/iio-test-format.c:208: 
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
>>
>> Signed-off-by: Pei Xiao <xiaopei01@...inos.cn>
>> Fixes: 8e74a48d17d5 ("iio: test: add basic tests for the iio-rescale driver")
>> ---
>>   drivers/iio/test/iio-test-rescale.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/iio/test/iio-test-rescale.c b/drivers/iio/test/iio-test-rescale.c
>> index 31ee55a6faed..11bfff6636a3 100644
>> --- a/drivers/iio/test/iio-test-rescale.c
>> +++ b/drivers/iio/test/iio-test-rescale.c
>> @@ -652,6 +652,8 @@ static void iio_rescale_test_scale(struct kunit *test)
>>   	int rel_ppm;
>>   	int ret;
>>   
>> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buff);
>> +
>>   	rescale.numerator = t->numerator;
>>   	rescale.denominator = t->denominator;
>>   	rescale.offset = t->offset;
>> @@ -681,6 +683,8 @@ static void iio_rescale_test_offset(struct kunit *test)
>>   	int values[2];
>>   	int ret;
>>   
>> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buff_off);
>> +
>>   	rescale.numerator = t->numerator;
>>   	rescale.denominator = t->denominator;
>>   	rescale.offset = t->offset;
>