[PATCH v4 0/3] accel/rocket: Fix job submit error handling

[PATCH v4 0/3] accel/rocket: Fix job submit error handling

[MoGGuU]

Several independent error paths in the Rocket job submission ioctl can be
triggered by unprivileged userspace. This series validates userspace BO
counts before passing them to helpers with signed count parameters, collects
implicit dependencies before the scheduler job is armed, and propagates the
first per-job submission error to userspace.

The series was tested on RK3588 with zero task counts, invalid task pointers,
invalid BO handles, and oversized BO counts. The requests returned the
expected error codes without warnings or errors in the kernel log.

Changes in v4:
- Added Sidong Yang's Reviewed-by tags, using the corrected email address.
- Dropped Cc: stable from patch 3 because propagating submission errors
  changes userspace-visible ioctl behavior.
- Rebased onto the current drm-misc-next branch.

Changes in v3:
- Kept the individual count checks before GEM lookup, but changed bo_count to
  int so check_add_overflow() rejects combined counts above INT_MAX, as
  suggested by Sidong Yang.

Changes in v2:
- Split the three independent fixes into separate patches as suggested by
  Sidong Yang.
- Rebased onto the then-current drm-misc-next branch.
- Dropped incidental blank-line-only changes from the original patch.
- Added Sidong Yang's Tested-by tag.

v3: https://lore.kernel.org/r/20260828050805.38548-1-Naixumogu@whut.edu.cn
v2: https://lore.kernel.org/r/20260827170608.39511-1-Naixumogu@whut.edu.cn
v1: https://lore.kernel.org/r/20260813142059.151644-1-Naixumogu@whut.edu.cn

MoGGuU (3):
  accel/rocket: Validate BO handle counts on job submission
  accel/rocket: Collect job dependencies before arming
  accel/rocket: Propagate job submission errors

 drivers/accel/rocket/rocket_job.c | 32 ++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)


base-commit: f9c2f70ee41544717b3c209083073db1e21f919b
-- 
2.43.0

[PATCH v4 1/3] accel/rocket: Validate BO handle counts on job submission

[MoGGuU]

The input and output BO handle counts are __u32, while GEM lookup and
reservation helpers take int counts. A count above INT_MAX cannot be
represented safely by the GEM lookup helper.

Reject each count above INT_MAX before looking up the BOs.

rocket_job_push() already uses check_add_overflow() for the combined count,
but stores the result in u32, so it only detects unsigned wraparound. Store
the result in int so sums above INT_MAX are rejected before the count is
passed to the reservation helpers.

Fixes: 0810d5ad88a1 ("accel/rocket: Add job submission IOCTL")
Cc: stable@vger.kernel.org
Tested-by: Sidong Yang <sidong.yang@furiosa.ai>
Reviewed-by: Sidong Yang <sidong.yang@furiosa.ai>
Signed-off-by: MoGGuU <Naixumogu@whut.edu.cn>
---
 drivers/accel/rocket/rocket_job.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/accel/rocket/rocket_job.c b/drivers/accel/rocket/rocket_job.c
index bb77b6bf0f231..e6052d1973afa 100644
--- a/drivers/accel/rocket/rocket_job.c
+++ b/drivers/accel/rocket/rocket_job.c
@@ -190,7 +190,7 @@ static int rocket_job_push(struct rocket_job *job)
 	struct rocket_device *rdev = job->rdev;
 	struct drm_gem_object **bos;
 	struct ww_acquire_ctx acquire_ctx;
-	u32 bo_count;
+	int bo_count;
 	int ret = 0;
 
 	if (check_add_overflow(job->in_bo_count, job->out_bo_count, &bo_count))
@@ -556,6 +556,11 @@ static int rocket_ioctl_submit_job(struct drm_device *dev, struct drm_file *file
 	if (job->task_count == 0)
 		return -EINVAL;
 
+	/* GEM lookup takes a signed object count. */
+	if (job->in_bo_handle_count > INT_MAX ||
+	    job->out_bo_handle_count > INT_MAX)
+		return -EINVAL;
+
 	rjob = kzalloc_obj(*rjob);
 	if (!rjob)
 		return -ENOMEM;
-- 
2.43.0

Re: [PATCH v4 1/3] accel/rocket: Validate BO handle counts on job submission

[Greg KH]

On Fri, Aug 28, 2026 at 02:19:14PM +0800, MoGGuU wrote:
> The input and output BO handle counts are __u32, while GEM lookup and
> reservation helpers take int counts. A count above INT_MAX cannot be
> represented safely by the GEM lookup helper.
> 
> Reject each count above INT_MAX before looking up the BOs.
> 
> rocket_job_push() already uses check_add_overflow() for the combined count,
> but stores the result in u32, so it only detects unsigned wraparound. Store
> the result in int so sums above INT_MAX are rejected before the count is
> passed to the reservation helpers.
> 
> Fixes: 0810d5ad88a1 ("accel/rocket: Add job submission IOCTL")
> Cc: stable@vger.kernel.org
> Tested-by: Sidong Yang <sidong.yang@furiosa.ai>
> Reviewed-by: Sidong Yang <sidong.yang@furiosa.ai>
> Signed-off-by: MoGGuU <Naixumogu@whut.edu.cn>

Real name please.

thanks,

greg k-h

Re: [PATCH v4 1/3] accel/rocket: Validate BO handle counts on job submission

[Haoming Gao]

Thanks for pointing this out.

My real name is Haoming Gao. I have corrected the author identity and
Signed-off-by tags and will resend the series as v5.

Regards,
Haoming Gao

[PATCH v4 2/3] accel/rocket: Collect job dependencies before arming

[MoGGuU]

rocket_job_push() arms the scheduler job before collecting its implicit
dependencies. Dependency collection can fail with -ENOMEM, but an armed
job must be pushed and must not be aborted with drm_sched_job_cleanup().

Collect dependencies before taking the scheduler lock and arming the job.
Only operations that cannot fail remain after drm_sched_job_arm().

Fixes: 0810d5ad88a1 ("accel/rocket: Add job submission IOCTL")
Cc: stable@vger.kernel.org
Tested-by: Sidong Yang <sidong.yang@furiosa.ai>
Reviewed-by: Sidong Yang <sidong.yang@furiosa.ai>
Signed-off-by: MoGGuU <Naixumogu@whut.edu.cn>
---
 drivers/accel/rocket/rocket_job.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/accel/rocket/rocket_job.c b/drivers/accel/rocket/rocket_job.c
index e6052d1973afa..b55e12aecfe64 100644
--- a/drivers/accel/rocket/rocket_job.c
+++ b/drivers/accel/rocket/rocket_job.c
@@ -206,19 +206,21 @@ static int rocket_job_push(struct rocket_job *job)
 	if (ret)
 		goto err;
 
+	ret = rocket_acquire_object_fences(job->in_bos, job->in_bo_count,
+					   &job->base, false);
+	if (ret)
+		goto err_unlock;
+
+	ret = rocket_acquire_object_fences(job->out_bos, job->out_bo_count,
+					   &job->base, true);
+	if (ret)
+		goto err_unlock;
+
 	scoped_guard(mutex, &rdev->sched_lock) {
 		drm_sched_job_arm(&job->base);
 
 		job->inference_done_fence = dma_fence_get(&job->base.s_fence->finished);
 
-		ret = rocket_acquire_object_fences(job->in_bos, job->in_bo_count, &job->base, false);
-		if (ret)
-			goto err_unlock;
-
-		ret = rocket_acquire_object_fences(job->out_bos, job->out_bo_count, &job->base, true);
-		if (ret)
-			goto err_unlock;
-
 		kref_get(&job->refcount); /* put by scheduler job completion */
 
 		drm_sched_entity_push_job(&job->base);
-- 
2.43.0

[PATCH v4 3/3] accel/rocket: Propagate job submission errors

[MoGGuU]

rocket_ioctl_submit() discards each job's return value and reports success
even when every job fails.

Return the first error and stop submitting the remaining jobs. Jobs queued
before an error remain queued, giving the ioctl ordered partial-submit
semantics.

Fixes: 0810d5ad88a1 ("accel/rocket: Add job submission IOCTL")
Tested-by: Sidong Yang <sidong.yang@furiosa.ai>
Reviewed-by: Sidong Yang <sidong.yang@furiosa.ai>
Signed-off-by: MoGGuU <Naixumogu@whut.edu.cn>
---
 drivers/accel/rocket/rocket_job.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/rocket/rocket_job.c b/drivers/accel/rocket/rocket_job.c
index b55e12aecfe64..8f1bdf4a57f20 100644
--- a/drivers/accel/rocket/rocket_job.c
+++ b/drivers/accel/rocket/rocket_job.c
@@ -646,8 +646,11 @@ int rocket_ioctl_submit(struct drm_device *dev, void *data, struct drm_file *fil
 	}
 
 
-	for (i = 0; i < args->job_count; i++)
-		rocket_ioctl_submit_job(dev, file, &jobs[i]);
+	for (i = 0; i < args->job_count; i++) {
+		ret = rocket_ioctl_submit_job(dev, file, &jobs[i]);
+		if (ret)
+			goto exit;
+	}
 
 exit:
 	kvfree(jobs);
-- 
2.43.0