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Added check for invalid baudrate divisor.

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waltje
2017-05-07 20:26:39 -04:00
parent 843ee11266
commit d75d630976
1 changed files with 10 additions and 5 deletions
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15
src/serial.c
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@@ -33,7 +33,7 @@
*
* Based on the 86Box serial port driver as a framework.
*
* Version: @(#)serial.c 1.0.3 2017/05/06
* Version: @(#)serial.c 1.0.4 2017/05/07
*
* Author: Fred N. van Kempen, <decwiz@yahoo.com>
* Copyright 2017 Fred N. van Kempen.
@@ -283,13 +283,18 @@ serial_write(uint16_t addr, uint8_t val, void *priv)
if ((sp->lcr & LCR_DLAB) && !(val & LCR_DLAB)) {
/* We dropped DLAB, so handle baudrate. */
baud = ((sp->dlab2 << 8) | sp->dlab1);
speed = 115200UL/baud;
if (baud > 0) {
speed = 115200UL/baud;
#if 0
pclog("Serial%d: new divisor %u, baudrate %ld\n",
pclog("Serial%d: divisor %u, baudrate %ld\n",
sp->port, baud, speed);
#endif
if (sp->bh != NULL)
bhtty_speed((BHTTY *)sp->bh, speed);
if (sp->bh != NULL)
bhtty_speed((BHTTY *)sp->bh, speed);
} else {
pclog("Serial%d: divisor %u invalid!\n",
sp->port, baud);
}
}
wl = (val & LCR_WLS) + 5; /* databits */
sb = (val & LCR_SBS) ? 2 : 1; /* stopbits */