linux-kernel - Re: [PATCH] drm: tests: Fix a buffer overflow in format_helper

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Message-ID: <5639218e-bcc8-55b0-ea30-7bf2b26c92b9@redhat.com>
Date:   Thu, 20 Oct 2022 10:03:13 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     José Expósito <jose.exposito89@...il.com>,
        David Gow <davidgow@...gle.com>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Maíra Canal <mairacanal@...eup.net>,
        dri-devel@...ts.freedesktop.org, Sam Ravnborg <sam@...nborg.org>,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH] drm: tests: Fix a buffer overflow in format_helper_test

On 10/19/22 19:29, José Expósito wrote:

[...]

>>  drivers/gpu/drm/tests/drm_format_helper_test.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
>> index 8d86c250c2ec..2191e57f2297 100644
>> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
>> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
>> @@ -438,7 +438,7 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
>>  	iosys_map_set_vaddr(&src, xrgb8888);
>>  
>>  	drm_fb_xrgb8888_to_xrgb2101010(&dst, &result->dst_pitch, &src, &fb, &params->clip);
>> -	buf = le32buf_to_cpu(test, buf, TEST_BUF_SIZE);
>> +	buf = le32buf_to_cpu(test, buf, dst_size / sizeof(u32));
>>  	KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
>>  }
> 
> Thanks a lot for fixing this bug David, I just tested it and
> worked as expected.
>

I've pushed this to drm-misc (drm-misc-fixes) now. Thanks!
 
> Do you think that we should update the other calls to
> le32buf_to_cpu() to follow a similar approach?
>

Feel free to post follow-up patches if you think that other changes are needed.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat