[Qemu-arm] [PATCH v1] display: limit irq handler index to TC6393XB_GPIOS

[P J P]

From: Prasad J Pandit <address@hidden>

The ctz32() routine could return value greater than
TC6393XB_GPIOS=16. This could lead to an OOB array access.
Mask 'level' to avoid it.

Reported-by: Moguofang <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
 hw/display/tc6393xb.c | 1 +
 1 file changed, 1 insertion(+)

Update: mask 'level' value to TC6393XB_GPIOS=16
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-12/msg01685.html

diff --git a/hw/display/tc6393xb.c b/hw/display/tc6393xb.c
index 74d10af3d4..0ae63605f0 100644
--- a/hw/display/tc6393xb.c
+++ b/hw/display/tc6393xb.c
@@ -172,6 +172,7 @@ static void tc6393xb_gpio_handler_update(TC6393xbState *s)
     int bit;
 
     level = s->gpio_level & s->gpio_dir;
+    level &= MAKE_64BIT_MASK(0, TC6393XB_GPIOS);
 
     for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
         bit = ctz32(diff);
-- 
2.13.6