USB: usb_serial_resume bug fix

Avoid potential null pointer dereference. Signed-off-by: Sarah Sharp <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
akeromi · Oct 25, 2007 · 8abaee2 · 8abaee2
1 parent da6fb57
commit 8abaee2
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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);