Re: [PATCH] media: vidtv: fix uninitialized args.buf_sz passed by value

[Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>]

On Fri, Feb 20, 2026 at 14:56 +0100, Thomas Weißschuh wrote:
> Hi Yihan Ding,
>
> On Fri, Feb 20, 2026 at 09:39:45PM +0800, Ding Yihan wrote:
>> While looking into this exact same syzbot report, I noticed that 
>> `vidtv_ts_pcr_write_into()` in the same file also suffers from the
>>  exact same pass-by-value anti-pattern (passing `struct pcr_write_args` by value). 
>
> Good catch.
>  
>> Since `pcr_write_args` also contains implicit padding, it remains a potential trigger
>>  for identical KMSAN uninit-value warnings during fuzzing in the future.
>
> The fact that the report is about implicit padding is valuable information.
> It should be part of the commit message.
>
>> Also, regarding Thomas's concern about modifying shared data: passing the struct 
>> as a `const pointer` (e.g., `const struct null_packet_write_args *`) 
>> would perfectly guarantee that the state remains read-only.
>
> Agreed.
>
>> Thomas, would it be worth submitting a separate patch now to fix
>> `vidtv_ts_pcr_write_into()` to prevent future KMSAN errors? Or would you
>> prefer this to be addressed together in Abd-Alrhman's v2?
>
> Doing it together sounds better. This is not urgent anyways in my opinion.
> But on the other hand I am just a random guy whose commit got wrongly blamed
> in the original Fixes tag and I don't know anything about this subsystem.
>
Sorry, I have misunderstood how the 'Fixes' tag works.

>
> Thomas

-- 
Best Regards,
Abd-Alrhman