Re: [PATCH RFC 11/18] accel/qda: Add GEM_CREATE and GEM_MMAP_OFFSET IOCTLs

[Ekansh Gupta]

On 2/24/2026 2:35 PM, Christian König wrote:
> On 2/23/26 20:09, Ekansh Gupta wrote:
> ...
>> +int qda_ioctl_gem_mmap_offset(struct drm_device *dev, void *data, struct 
>> drm_file *file_priv)
>> +{
>> +       struct drm_qda_gem_mmap_offset *args = data;
>> +       struct drm_gem_object *gem_obj;
>> +       int ret;
>> +
>> +       gem_obj = qda_gem_lookup_object(file_priv, args->handle);
>> +       if (IS_ERR(gem_obj))
>> +               return PTR_ERR(gem_obj);
>> +
>> +       ret = drm_gem_create_mmap_offset(gem_obj);
>> +       if (ret == 0)
>> +               args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
>> +
>> +       drm_gem_object_put(gem_obj);
>> +       return ret;
> You should probably use drm_gem_dumb_map_offset() instead of open coding this.
>
> Otherwise you allow mmap() of imported objects which is not allowed at all.
Thanks for pointing this, Christian. I'll read more about this and fix as per 
your suggestion.
>
> Regards,
> Christian.