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From: P J P <ppandit@redhat.com>
To: Qemu Developers <qemu-devel@nongnu.org>
Cc: Peter Maydell <peter.maydell@linaro.org>,
	Moguofang <moguofang@huawei.com>,
	qemu-arm@nongnu.org, Prasad J Pandit <pjp@fedoraproject.org>
Subject: [Qemu-devel] [PATCH v1] display: limit irq handler index to TC6393XB_GPIOS
Date: Tue, 12 Dec 2017 09:45:39 +0530	[thread overview]
Message-ID: <20171212041539.25700-1-ppandit@redhat.com> (raw)

From: Prasad J Pandit <pjp@fedoraproject.org>

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 <moguofang@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
---
 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

             reply	other threads:[~2017-12-12  4:15 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-12  4:15 P J P [this message]
2017-12-12 18:03 ` [Qemu-devel] [PATCH v1] display: limit irq handler index to TC6393XB_GPIOS Peter Maydell

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