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Re: [Qemu-devel] [PATCH] char: serial: check divider value against baud
From: |
Huawei PSIRT |
Subject: |
Re: [Qemu-devel] [PATCH] char: serial: check divider value against baud base |
Date: |
Wed, 12 Oct 2016 09:39:26 +0800 |
Dear,
Thank you very much for your support. And will you assign a CVE-ID for the
issue?
Best regards,
Huawei PSIRT
-----邮件原件-----
发件人: P J P [mailto:address@hidden
发送时间: 2016年10月12日 0:28
收件人: Qemu Developers
抄送: Michael S. Tsirkin; Paolo Bonzini; Huawei PSIRT; Prasad J Pandit
主题: [PATCH] char: serial: check divider value against baud base
From: Prasad J Pandit <address@hidden>
16550A UART device uses an oscillator to generate frequencies (baud base),
which decide communication speed. This speed could be changed by dividing it
by a divider. If the divider is greater than the baud base, speed is set to
zero, leading to a divide by zero error. Add check to avoid it.
Reported-by: Huawei PSIRT <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/char/serial.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/char/serial.c b/hw/char/serial.c index 3442f47..f659bbd
100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -153,7 +153,7 @@ static void serial_update_parameters(SerialState *s)
int speed, parity, data_bits, stop_bits, frame_size;
QEMUSerialSetParams ssp;
- if (s->divider == 0)
+ if (s->divider == 0 || s->divider > s->baudbase)
return;
/* Start bit. */
--
2.5.5