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tty: serial: 8250: 8250_gsc:- Handle return NULL error from ioremap_nocache

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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: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arvind Yadav 2017-01-19 13:30:44 +05:30 committed by Greg Kroah-Hartman
parent 28ec9570a2
commit 2cc32b18d1
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/8250/8250_gsc.c
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@ -60,6 +60,10 @@ static int __init serial_init_chip(struct parisc_device *dev)
7272727 : 1843200; 7272727 : 1843200;
uart.port.mapbase = address; uart.port.mapbase = address;
uart.port.membase = ioremap_nocache(address, 16); 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.irq = dev->irq;
uart.port.flags = UPF_BOOT_AUTOCONF; uart.port.flags = UPF_BOOT_AUTOCONF;
uart.port.dev = &dev->dev; uart.port.dev = &dev->dev;