From 6bdd9719a00061d387517cd5690e2130525d5e6b Mon Sep 17 00:00:00 2001
From: Pan Bian <bianpan2016@163.com>
Date: Sat, 3 Dec 2016 18:40:25 +0800
Subject: [PATCH 170/255] tty: serial: sh-sci: set error code when kasprintf
 fails

When the call to kasprintf() returns a NULL pointer, function
sci_request_irq() frees the preallocated memory and returns 0 is
returned. Because 0 means no error, the caller of sci_request_irq()
will keep going, and the freed memory may be used or freed again. To
avoid the above issue, this patch assigns "-ENOMEM" to the return
variable ret.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188691

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 623ac1d4a52f279d9379bae61ae1eb37c5767f96)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/tty/serial/sh-sci.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1743,8 +1743,10 @@ static int sci_request_irq(struct sci_po
 		desc = sci_irq_desc + i;
 		port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s",
 					    dev_name(up->dev), desc->desc);
-		if (!port->irqstr[j])
+		if (!port->irqstr[j]) {
+			ret = -ENOMEM;
 			goto out_nomem;
+		}
 
 		ret = request_irq(irq, desc->handler, up->irqflags,
 				  port->irqstr[j], port);