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Ip=[149.199.60.100]; Helo=[xsj-pvapsmtpgw02] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2PR02MB2003 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.38.86 Subject: [Qemu-devel] [PATCH v1 1/1] cadence_uart: Check baud rate generator and divider values on migration X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alistair23@gmail.com, psirt@huawei.com, pjp@fedoraproject.org, alistair.francis@xilinx.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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. Checks were recently added when writing to these registers but not when restoring from migration. This patch adds checks when restoring from migration to avoid divide by zero errors. Reported-by: Huawei PSIRT Signed-off-by: Alistair Francis --- hw/char/cadence_uart.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c index def34cd..e3a6248 100644 --- a/hw/char/cadence_uart.c +++ b/hw/char/cadence_uart.c @@ -487,6 +487,19 @@ static int cadence_uart_post_load(void *opaque, int version_id) { CadenceUARTState *s = opaque; + /* Ensure these two aren't invalid numbers */ + if (s->r[R_BRGR] <= 1) { + /* Value is invalid, reset it */ + s->r[R_BRGR] = 0x0000028B; + } + if (s->r[R_BDIV] <= 3) { + /* Value is invalid, reset it */ + s->r[R_BDIV] = 0x0000000F; + } + + s->r[R_BRGR] = s->r[R_BRGR] & 0xFFFF; + s->r[R_BDIV] = s->r[R_BDIV] & 0xFF; + uart_parameters_setup(s); uart_update_status(s); return 0;