It occurred to me that we never actually check this! So let's start
doing that.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 74823afb262e..8ef0c5f5c7cf 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3213,7 +3213,7 @@ drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr,
{
struct drm_dp_vcpi_allocation *vcpi;
struct drm_dp_mst_port *port;
- int avail_slots = 63, ret;
+ int avail_slots = 63, payload_count = 0, ret;
list_for_each_entry(vcpi, &mst_state->vcpis, next) {
/* Ports that no longer exist shouldn't be counted towards the
@@ -3238,6 +3238,13 @@ drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr,
goto port_fail;
}
+ 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);
+ ret = -EINVAL;
+ goto port_fail;
+ }
+
drm_dp_put_port(port);
}
DRM_DEBUG_ATOMIC("[MST MGR:%p] mst_state %p vcpi avail=%d used=%d\n",
--
2.19.1
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