From 0a54d68547df3f276dc242b52d54e8549d0a84a0 Mon Sep 17 00:00:00 2001
From: Chuan Zheng <zhengchuan@huawei.com>
Date: Wed, 9 Feb 2022 11:21:28 +0800
Subject: [PATCH] ps2: fix oob in ps2 kbd

fix oob in ps2 kbd
---
 hw/input/ps2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index c8fd23cf36..b647561069 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -167,7 +167,7 @@ void ps2_queue_noirq(PS2State *s, int b)
     }
 
     q->data[q->wptr] = b;
-    if (++q->wptr == PS2_BUFFER_SIZE) {
+    if (++q->wptr >= PS2_BUFFER_SIZE) {
         q->wptr = 0;
     }
     q->count++;
@@ -557,7 +557,7 @@ uint32_t ps2_read_data(PS2State *s)
         val = q->data[index];
     } else {
         val = q->data[q->rptr];
-        if (++q->rptr == PS2_BUFFER_SIZE) {
+        if (++q->rptr >= PS2_BUFFER_SIZE) {
             q->rptr = 0;
         }
         q->count--;
-- 
2.27.0