It occurred to me that we never actually check this! So let's start
doing that.
Signed-off-by: Lyude Paul <ly...@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Cc: David Airlie <airl...@redhat.com>
Cc: Jerry Zuo <jerry....@amd.com>
Cc: Harry Wentland <harry.wentl...@amd.com>
Cc: Juston Li <juston...@intel.com>
---
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 c33c4a3aec34..fc9bcbb55417 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3647,7 +3647,7 @@ drm_dp_mst_atomic_check_topology_state(struct
drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_topology_state
*mst_state)
{
struct drm_dp_vcpi_allocation *vcpi;
- int avail_slots = 63;
+ int avail_slots = 63, payload_count = 0;
list_for_each_entry(vcpi, &mst_state->vcpis, next) {
/* Releasing VCPI is always OK-even if the port is gone */
@@ -3667,6 +3667,12 @@ drm_dp_mst_atomic_check_topology_state(struct
drm_dp_mst_topology_mgr *mgr,
avail_slots + vcpi->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, mst_state, mgr->max_payloads);
+ return -EINVAL;
+ }
}
DRM_DEBUG_ATOMIC("[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n",
mgr, mst_state, avail_slots,
--
2.20.1
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