Re: [PATCH] drm/nouveau/gsp: Fix possible NULL pointer dereference warning in r535_dmac_alloc

[Danilo Krummrich <dakr@kernel.org>]

On 4/18/26 7:44 PM, Timur Tabi wrote:
> On Sat, 2026-04-18 at 19:35 +0200, Danilo Krummrich wrote:
>>> I posted a patch a couple months ago that cleans up an IS_ERR check, but it was never picked
>>> up:
>>
>> Thanks! Can you please make sure to send patches to all maintainers? If they
>> don't land in my inbox, I can't pick them up. :(
> 
> M:  Lyude Paul <lyude@redhat.com>
> M:  Danilo Krummrich <dakr@kernel.org>
> 
> Hmmmm.... I did CC Lyude, but you're right.  I should update my git-email script to catch these
> better.
> 
> While I have your attention, I do have other patches that I neglected to CC you on:
> 
>   2. [PATCH 6/6] drm/nouveau/gsp: enable FWSEC-SB on GA100
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [95%]
> 
>   3. [PATCH 2/6] drm/nouveau/bios: specify correct display fuse register for Ampere and Ada
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [95%]
> 
>   4. [PATCH 1/6] drm/nouveau: check for GA100 specifically when calculating FRTS size
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [91%]
> 
>   5. [PATCH 4/6] drm/nouveau/gsp: require GSP-RM for GA100 support
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [97%]
> 
>   6. [PATCH 3/6] drm/nouveau/bios: skip the IFR header if present
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [75%]
> 
>   7. [PATCH 5/6] drm/nouveau: parse the VBIOS on GA100
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [99%]
> 
>   8. [PATCH 0/6] drm/nouveau: fix GA100 issues
>      - by Timur Tabi @ 2026-04-07 19:21 UTC [93%]
> 
>   9. [PATCH] drm/nouveau: expose VBIOS via debugfs on GSP-RM systems
>      - by Timur Tabi @ 2026-04-07 18:53 UTC [95%]

Ok, I will take a look in the next days.

Thanks,
Danilo

>>> https://lore.freedesktop.org/nouveau/20260103000756.1002890-1-ttabi@nvidia.com/T/#u
>>>
>>> I'm quite certain that there are other similar issues in Nouveau w.r.t. IS_ERR_OR_NULL.
>>
>> Yeah, that sounds likely.
>>
>>> I think an audit of the Nouveau error paths is in order.  I suspect that Ben's big refactors
>>> over the past year have resulted in some invalid error paths.
>>
>> Are you planning to look into this?
> 
> No, but it does sound like something that Claude could figure out pretty quick.