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cadence_uart: Check baud rate generator and divider values on migration 

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 <psirt@huawei.com>
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Message-id: 04ae30ed8ee1758cd2d2af880da4d28f74c67738.1481132150.git.alistair.francis@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
master
Alistair Francis 2016-12-27 14:59:22 +00:00 committed by Peter Maydell
parent a470b33259
commit 450aaae863
1 changed files with 7 additions and 0 deletions
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7
hw/char/cadence_uart.c
View File

@ -502,6 +502,13 @@ 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 || s->r[R_BRGR] & ~0xFFFF ||
s->r[R_BDIV] <= 3 || s->r[R_BDIV] & ~0xFF) {
/* Value is invalid, abort */
return 1;
}
uart_parameters_setup(s);
uart_update_status(s);
return 0;