From: Alan Cox <alan@redhat.com>
Date: Thu, 30 Oct 2008 15:54:12 +0000 (+0000)
Subject: tty: Fix USB kref leak
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fce4877a6792ad72b88f6fd7556d19da5f20364d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

tty: Fix USB kref leak

When we close we must clear the extra reference we got when we read
port->tty. Setting the port tty NULL will clear the kref held by the driver
but not the one we obtained ourselves while doing the lookup.

Signed-off-by: Alan Cox <alan@redhat.com>
Tested-by: Helge Hafting <helge.hafting@aitel.hist.no>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 8be3f39891c7..794b5ffe4397 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -281,6 +281,7 @@ static void serial_close(struct tty_struct *tty, struct file *filp)
 			if (tty->driver_data)
 				tty->driver_data = NULL;
 			tty_port_tty_set(&port->port, NULL);
+			tty_kref_put(tty);
 		}
 	}