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tty/8250_early: Don't truncate last character of options

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The earlier change to use strlcpy uncovered a bug in the options
argument length calculation causing last character to be truncated.
This makes the actual console to be configured with incorrect
baudrate when specifying the console using console=uart,... syntax.

Bug symptom seen in kernel log output:

Kernel command line: console=uart,mmio,0x90000000,115200
Early serial console at MMIO 0x90000000 (options '11520')

which then results in a invalid baud rate 11520 instead of the
expected 115200 when the console is switched to ttyS0 later
in the boot process.

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Henrik Nordström 2013-07-23 21:06:07 +02:00 committed by Greg Kroah-Hartman
parent 2652c2163d
commit 258a9fd17b
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/8250/8250_early.c
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@ -193,7 +193,8 @@ static int __init parse_options(struct early_serial8250_device *device,
if (options) {
options++;
device->baud = simple_strtoul(options, NULL, 0);
length = min(strcspn(options, " "), sizeof(device->options));
length = min(strcspn(options, " ") + 1,
sizeof(device->options));
strlcpy(device->options, options, length);
} else {
device->baud = probe_baud(port);