Re: [PATCH] iio: test : check null return of kunit_kmalloc in iio_rescale_test_scale

[Jonathan Cameron <jic23@kernel.org>]

On Mon, 4 Nov 2024 09:14:45 +0800
Pei Xiao <xiaopei01@kylinos.cn> wrote:

> On 2024/11/2 01:29, Jonathan Cameron Wrote:
> > On Wed, 30 Oct 2024 11:48:54 +0800
> > Pei Xiao <xiaopei01@kylinos.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);
Ok. May be worth a follow up to tidy that up. A couple more cases do no real harm.

Applied to the fixes-togreg branch of iio.git.

Thanks,

Jonathan

> >>
> >> Signed-off-by: Pei Xiao <xiaopei01@kylinos.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;  
> >