[RFC PATCH 29/30] vfio: Add support for Shared Virtual Memory

[Tomasz Nowicki]

On 26.04.2017 12:08, Jean-Philippe Brucker wrote:
> On 26/04/17 07:53, Tomasz Nowicki wrote:
>>> +        mutex_lock(&device->tasks_lock);
>>> +        list_for_each_entry(vfio_task, &device->tasks, list) {
>>> +            if (vfio_task->pasid != svm.pasid)
>>> +                continue;
>>> +
>>> +            ret = iommu_unbind_task(device->dev, svm.pasid, flags);
>>> +            if (ret)
>>> +                dev_warn(device->dev, "failed to unbind PASID %u\n",
>>> +                     vfio_task->pasid);
>>> +
>>> +            list_del(&vfio_task->list);
>>> +            kfree(vfio_task);
>>
>> Please use list_for_each_entry_safe.
>
> There is:
>
> +            break;
>
> right after kfree, so we'd never follow vfio_task->list.next after freeing
> vfio_task. The code searches for the _only_ task matching the PASID,
> removes it and leaves the loop.
>

Ah right. Sorry for the noise.

Tomasz