It occurred to me that we never actually check this! So let's start
doing that.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index adb4298570cc..cafb769a4ec3 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3225,7 +3225,7 @@ static int drm_dp_mst_atomic_check(struct drm_private_obj *obj,
to_dp_mst_topology_state(state);
struct drm_dp_mst_topology_mgr *mgr = mst_state->mgr;
struct drm_dp_vcpi_allocation *pos;
- int avail_slots = 63;
+ int avail_slots = 63, payload_count = 0;
list_for_each_entry(pos, &mst_state->vcpis, next) {
DRM_DEBUG_ATOMIC("[MST PORT:%p] requires %d vcpi slots\n",
@@ -3238,6 +3238,12 @@ static int drm_dp_mst_atomic_check(struct drm_private_obj *obj,
avail_slots + pos->vcpi);
return -ENOSPC;
}
+
+ if (++payload_count > mgr->max_payloads) {
+ DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p has too many payloads (max=%d)\n",
+ mgr, state, mgr->max_payloads);
+ return -EINVAL;
+ }
}
DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p vcpi avail=%d used=%d\n",
mgr, state, avail_slots, 63 - avail_slots);
--
2.17.2
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