Commit 84da1516 authored by Prasad J Pandit's avatar Prasad J Pandit Committed by Peter Maydell
Browse files

timer: stm32f2xx_timer: add check for prescaler value 



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: default avatarHuawei PSIRT <psirt@huawei.com>
Signed-off-by: default avatarPrasad J Pandit <pjp@fedoraproject.org>
Message-id: 1476800269-31902-1-git-send-email-ppandit@redhat.com
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 0fa758c3

hw/timer/stm32f2xx_timer.c

+1 −1
Original line number Diff line number Diff line
@@ -217,7 +217,7 @@ 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: