Commit 2cc32b18 authored by Arvind Yadav's avatar Arvind Yadav Committed by Greg Kroah-Hartman
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tty: serial: 8250: 8250_gsc:- Handle return NULL error from ioremap_nocache 



Here, If ioremap_nocache will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.

Signed-off-by: default avatarArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 28ec9570

drivers/tty/serial/8250/8250_gsc.c

+4 −0
Original line number Diff line number Diff line
@@ -60,6 +60,10 @@ static int __init serial_init_chip(struct parisc_device *dev) 
					7272727 : 1843200;

	uart.port.mapbase	= address;

	uart.port.membase	= ioremap_nocache(address, 16);

	if (!uart.port.membase) {

		dev_warn(&dev->dev, "Failed to map memory\n");

		return -ENOMEM;

	}

	uart.port.irq	= dev->irq;

	uart.port.flags	= UPF_BOOT_AUTOCONF;

	uart.port.dev	= &dev->dev;