[patch 37/47] serial8250: sanity check nr_uarts on all paths.

[Greg KH]

2.6.25-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>

commit 05d81d2222beec7b63ac8c1c8cdb5bb4f82c2bad upstream

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@xxxxxxxxxxxx>
Acked-by: Alan Cox <alan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/serial/8250.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2564,6 +2564,9 @@ static struct console serial8250_console
 
 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;

-- 
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