From: Sarah Sharp <sarah.a.sharp@intel.com>
Date: Thu, 25 Oct 2007 17:58:43 +0000 (-0700)
Subject: USB: usb_serial_resume bug fix
X-Git-Tag: firefly_0821_release~24602^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8abaee238ebb1ef9b8bcafac7a1833f92e7f2319;p=firefly-linux-kernel-4.4.55.git

USB: usb_serial_resume bug fix

Avoid potential null pointer dereference.

Signed-off-by: Sarah Sharp <sarah.a.sharp@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 426afaa0d9b8..497e29a700ca 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1123,7 +1123,9 @@ int usb_serial_resume(struct usb_interface *intf)
 {
 	struct usb_serial *serial = usb_get_intfdata(intf);
 
-	return serial->type->resume(serial);
+	if (serial->type->resume)
+		return serial->type->resume(serial);
+	return 0;
 }
 EXPORT_SYMBOL(usb_serial_resume);