serial8250: sanity check nr_uarts on all paths.
I had 8250.nr_uarts=16 in the boot line of a test kernel and I had a weird
mysterious crash in sysfs. After taking an in-depth look I realized that
CONFIG_SERIAL_8250_NR_UARTS was set to 4 and I was walking off the end of
the serial8250_ports array.
Ouch!!!
Don't let this happen to someone else.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Alan Cox <alan@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 1bc00b7..be95e55 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2623,6 +2623,9 @@
static int __init serial8250_console_init(void)
{
+ if (nr_uarts > UART_NR)
+ nr_uarts = UART_NR;
+
serial8250_isa_init_ports();
register_console(&serial8250_console);
return 0;