From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 30 Jun 2015 13:12:42 +0000 (+0100)
Subject: serial: 8250: Don't crash when nr_uarts is 0
X-Git-Tag: archive/raspbian/4.9.51-1+rpi1~5^2~523
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=a9ed4fd970f75f35dca0ea73625ebc6c4d770cb9;p=linux-4.9.git

serial: 8250: Don't crash when nr_uarts is 0
---

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index e8819aa20415..cf9c7d2e3f95 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -509,6 +509,8 @@ static void __init serial8250_isa_init_ports(void)
 
 	if (nr_uarts > UART_NR)
 		nr_uarts = UART_NR;
+	if (!nr_uarts)
+		return;
 
 	for (i = 0; i < nr_uarts; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];