From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58928) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bzqIH-0003wW-Bl for qemu-devel@nongnu.org; Thu, 27 Oct 2016 15:24:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bzqIG-0002MY-8c for qemu-devel@nongnu.org; Thu, 27 Oct 2016 15:24:53 -0400 From: P J P Date: Fri, 28 Oct 2016 00:54:38 +0530 Message-Id: <1477596278-1470-1-git-send-email-ppandit@redhat.com> Subject: [Qemu-devel] [PATCH v4] char: cadence: check baud rate generator and divider values List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Qemu Developers Cc: qemu-arm , Huawei PSIRT , Alistair Francis , "Edgar E . Iglesias" , Peter Maydell , Prasad J Pandit From: Prasad J Pandit 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 Signed-off-by: Prasad J Pandit --- hw/char/cadence_uart.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) Update: remove default reset value assignment. -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg07206.html diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c index e3bc52f..4a3c4c6 100644 --- a/hw/char/cadence_uart.c +++ b/hw/char/cadence_uart.c @@ -1,6 +1,11 @@ /* * Device model for Cadence UART * + * Reference: Xilinx Zynq 7000 reference manual + * - http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf + * - Chapter 19 UART Controller + * - Appendix B for Register details + * * Copyright (c) 2010 Xilinx Inc. * Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com) * Copyright (c) 2012 PetaLogix Pty Ltd. @@ -410,6 +415,16 @@ static void uart_write(void *opaque, hwaddr offset, break; } break; + case R_BRGR: /* Baud rate generator */ + if (value >= 0x01) { + s->r[offset] = value & 0xFFFF; + } + break; + case R_BDIV: /* Baud rate divider */ + if (value >= 0x04) { + s->r[offset] = value & 0xFF; + } + break; default: s->r[offset] = value; } -- 2.7.4