From oneukum@suse.de Sun Jul 22 23:56:43 2007 From: Oliver Neukum Date: Mon, 23 Jul 2007 08:58:39 +0200 Subject: USB: fix usb_serial_suspend(): buggy code To: Adrian Bunk Cc: Greg Kroah-Hartman , linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Message-ID: <200707230858.39752.oneukum@suse.de> Content-Disposition: inline Am Montag 23 Juli 2007 schrieb Adrian Bunk: > Commit ec22559e0b7a05283a3413bda5d177e42c950e23 added the following > function to drivers/usb/serial/usb-serial.c: > [..] > > The Coverity checker spotted the inconsequent NULL checking for "serial". > > Looking at the code it also doesn't seem to have been intended to always > return 0. Coverity is right. The check for NULL is wrongly done and the error return is lost. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/usb-serial.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1077,16 +1077,17 @@ int usb_serial_suspend(struct usb_interf struct usb_serial_port *port; int i, r = 0; - if (serial) { - for (i = 0; i < serial->num_ports; ++i) { - port = serial->port[i]; - if (port) - kill_traffic(port); - } + if (!serial) /* device has been disconnected */ + return 0; + + for (i = 0; i < serial->num_ports; ++i) { + port = serial->port[i]; + if (port) + kill_traffic(port); } if (serial->type->suspend) - serial->type->suspend(serial, message); + r = serial->type->suspend(serial, message); return r; }