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USB: sierra: add more checks on shutdown 

This should help with any potential NULL pointer usages as reported by a
few users.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2007-04-26 00:12:01 -07:00
parent 931384fb0e
commit f094e4f358
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/serial/sierra.c
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@ -577,7 +577,12 @@ static void sierra_shutdown(struct usb_serial *serial)
/* Stop reading/writing urbs */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
if (!port)
continue;
portdata = usb_get_serial_port_data(port);
if (!portdata)
continue;
for (j = 0; j < N_IN_URB; j++)
usb_unlink_urb(portdata->in_urbs[j]);
for (j = 0; j < N_OUT_URB; j++)
@ -587,7 +592,11 @@ static void sierra_shutdown(struct usb_serial *serial)
/* Now free them */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
if (!port)
continue;
portdata = usb_get_serial_port_data(port);
if (!portdata)
continue;
for (j = 0; j < N_IN_URB; j++) {
if (portdata->in_urbs[j]) {
@ -606,6 +615,8 @@ static void sierra_shutdown(struct usb_serial *serial)
/* Now free per port private data */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
if (!port)
continue;
kfree(usb_get_serial_port_data(port));
}
}