From: Prasad J Pandit <p...@fedoraproject.org> The Cadence UART device emulator calculates speed by dividing the baud rate by a 'baud rate generator' & 'baud rate divider' value. The device specification defines these register values to be non-zero and within certain limits. Add checks for these limits to avoid errors like divide by zero.
Reported-by: Huawei PSIRT <ps...@huawei.com> Signed-off-by: Prasad J Pandit <p...@fedoraproject.org> --- hw/char/cadence_uart.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) Update: set register values as per the specification -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg04931.html diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c index e3bc52f..c176446 100644 --- a/hw/char/cadence_uart.c +++ b/hw/char/cadence_uart.c @@ -1,5 +1,6 @@ /* * Device model for Cadence UART + * -> http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf * * Copyright (c) 2010 Xilinx Inc. * Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwa...@petalogix.com) @@ -410,6 +411,18 @@ static void uart_write(void *opaque, hwaddr offset, break; } break; + case R_BRGR: /* Baud rate generator */ + s->r[offset] = 0x028B; /* default reset value */ + if (value >= 0x01 && value <= 0xFFFF) { + s->r[offset] = value; + } + break; + case R_BDIV: /* Baud rate divider */ + s->r[offset] = 0x0F; + if (value >= 0x04 && value <= 0xFF) { + s->r[offset] = value; + } + break; default: s->r[offset] = value; } -- 2.7.4
