1 files changed, 2 insertions, 0 deletions

diff --git a/src/synaptics.c b/src/synaptics.c
index 27a37d7..0472197 100644
--- a/src/synaptics.c
+++ b/src/synaptics.c
@@ -977,6 +977,7 @@ SynapticsReset(SynapticsPrivate * priv)
     priv->lastButtons = 0;
     priv->prev_z = 0;
     priv->prevFingers = 0;
+    priv->num_active_touches = 0;
     memset(priv->open_slots, 0, priv->num_slots * sizeof(int));
 }
 
@@ -2611,6 +2612,7 @@ UpdateTouchState(InputInfoPtr pInfo, struct SynapticsHwState *hw)
         if (hw->slot_state[i] == SLOTSTATE_OPEN) {
             priv->open_slots[priv->num_active_touches] = i;
             priv->num_active_touches++;
+            BUG_WARN(priv->num_active_touches > priv->num_slots);
         }
         else if (hw->slot_state[i] == SLOTSTATE_CLOSE) {
             Bool found = FALSE;