[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-arm] [PATCH] timer: stm32f2xx_timer: add check for prescaler value
From: |
P J P |
Subject: |
[Qemu-arm] [PATCH] timer: stm32f2xx_timer: add check for prescaler value |
Date: |
Tue, 18 Oct 2016 19:47:49 +0530 |
From: Prasad J Pandit <address@hidden>
The STM32F2XX Timer emulator uses a 16 bit prescaler value to
limit the timer clock rate. It does that by dividing the timer
frequency. If the prescaler 's->tim_psc' was set to be UINT_MAX,
it'd lead to divide by zero error. Limit prescaler value to 16
bits to avoid it.
Reported-by: Huawei PSIRT <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/timer/stm32f2xx_timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/timer/stm32f2xx_timer.c b/hw/timer/stm32f2xx_timer.c
index bf0fb28..2cad36d 100644
--- a/hw/timer/stm32f2xx_timer.c
+++ b/hw/timer/stm32f2xx_timer.c
@@ -208,7 +208,7 @@ static void stm32f2xx_timer_write(void *opaque, hwaddr
offset,
return;
case TIM_PSC:
timer_val = stm32f2xx_ns_to_ticks(s, now) - s->tick_offset;
- s->tim_psc = value;
+ s->tim_psc = value & 0xFFFF;
value = timer_val;
break;
case TIM_CNT:
--
2.7.4
- [Qemu-arm] [PATCH] timer: stm32f2xx_timer: add check for prescaler value,
P J P <=