From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Thu, 30 Jun 2005 21:41:22 +0000 (+0100)
Subject: [PATCH] Serial: Fix small CONFIG_SERIAL_8250_NR_UARTS
X-Git-Tag: firefly_0821_release~43128^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=44454bcdb90532b372c74e3546043d8a3a468939;p=firefly-linux-kernel-4.4.55.git

[PATCH] Serial: Fix small CONFIG_SERIAL_8250_NR_UARTS

If CONFIG_SERIAL_8250_NR_UARTS is smaller than the array size in
asm/serial.h, we trampled on memory which wasn't ours.  Take our
big boots away by limiting the number of ports initialised to the
smaller of ...NR_UARTS and the array size.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 9224fc3184ea..7e8fc7c1d4cc 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2061,7 +2061,8 @@ static void __init serial8250_isa_init_ports(void)
 		up->port.ops = &serial8250_pops;
 	}
 
-	for (i = 0, up = serial8250_ports; i < ARRAY_SIZE(old_serial_port);
+	for (i = 0, up = serial8250_ports;
+	     i < ARRAY_SIZE(old_serial_port) && i < UART_NR;
 	     i++, up++) {
 		up->port.iobase   = old_serial_port[i].port;
 		up->port.irq      = irq_canonicalize(old_serial_port[i].irq);