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SubjectRe: [PATCH] drm/panfrost: Add sanity checks to submit IOCTL
On Wed, Apr 24, 2019 at 03:13:53PM +0200, Tomeu Vizoso wrote:
> So userspace can get feedback on any error conditions, instead of going
> ahead and things breaking later.
>
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

Bonus: some igts to exercise these corner cases. It helps a lot with uapi
review and testing.
-Daniel

> ---
> drivers/gpu/drm/panfrost/panfrost_drv.c | 35 +++++++++++++++++--------
> 1 file changed, 24 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index c06af78ab833..0f2863cb8077 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -172,13 +172,27 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> {
> struct panfrost_device *pfdev = dev->dev_private;
> struct drm_panfrost_submit *args = data;
> - struct drm_syncobj *sync_out;
> + struct drm_syncobj *sync_out = NULL;
> struct panfrost_job *job;
> int ret = 0;
>
> + if (!args->jc)
> + return -EINVAL;
> +
> + if (args->requirements && args->requirements != PANFROST_JD_REQ_FS)
> + return -EINVAL;
> +
> + if (args->out_sync > 0) {
> + sync_out = drm_syncobj_find(file, args->out_sync);
> + if (!sync_out)
> + return -ENODEV;
> + }
> +
> job = kzalloc(sizeof(*job), GFP_KERNEL);
> - if (!job)
> - return -ENOMEM;
> + if (!job) {
> + ret = -ENOMEM;
> + goto fail_out_sync;
> + }
>
> kref_init(&job->refcount);
>
> @@ -190,25 +204,24 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
>
> ret = panfrost_copy_in_sync(dev, file, args, job);
> if (ret)
> - goto fail;
> + goto fail_job;
>
> ret = panfrost_lookup_bos(dev, file, args, job);
> if (ret)
> - goto fail;
> + goto fail_job;
>
> ret = panfrost_job_push(job);
> if (ret)
> - goto fail;
> + goto fail_job;
>
> /* Update the return sync object for the job */
> - sync_out = drm_syncobj_find(file, args->out_sync);
> - if (sync_out) {
> + if (sync_out)
> drm_syncobj_replace_fence(sync_out, job->render_done_fence);
> - drm_syncobj_put(sync_out);
> - }
>
> -fail:
> +fail_job:
> panfrost_job_put(job);
> +fail_out_sync:
> + drm_syncobj_put(sync_out);
>
> return ret;
> }
> --
> 2.20.1
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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