src/synaptics.c | 2 ++
1 file changed, 2 insertions(+)
New commits:
commit eae444eb1a85d2401501d29f9a6c654c046f806b
Author: Peter Hutterer <peter.hutte...@who-t.net>
Date: Thu Aug 30 16:38:38 2012 +1000
Reset num_active_touches on DeviceOff (#52496)
When disabling the device, reset num_active_touches to zero. Otherwise,
num_active_touches stays at the value it was on DeviceOff(). Future touches
add to that value until the index may go past priv->open_slots[].
That causes spurious memory corruption on touch ends.
And as of 55fc42e7c9b4948cadd4f98ef7b6a3b12e268e3e we ignore pre-existing
touches anyway.
Test-case:
- place num_touches fingers on the touchpad
- xinput disable <device>
- lift fingers
- xinput enable <device>
- place finger on device, num_active_touches is now (num_touches + 1)
X.Org Bug 52496 <http://bugs.freedesktop.org/show_bug.cgi?id=52496>
Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net>
Reviewed-by: Chase Douglas <chase.doug...@canonical.com>
(cherry picked from commit a245d42f53096b1ae81e6702729f97ca508e5b5b)
Conflicts:
src/synaptics.c
diff --git a/src/synaptics.c b/src/synaptics.c
index cd9f936..a28e984 100644
--- a/src/synaptics.c
+++ b/src/synaptics.c
@@ -1154,6 +1154,7 @@ SynapticsReset(SynapticsPrivate * priv)
priv->prev_z = 0;
priv->prevFingers = 0;
#ifdef HAVE_MULTITOUCH
+ priv->num_active_touches = 0;
memset(priv->open_slots, 0, priv->num_slots * sizeof(int));
#endif
}
@@ -3118,6 +3119,7 @@ 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;
--
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