From: Greg Kroah-Hartman <gregkh@suse.de>
Date: Thu, 26 Apr 2007 07:12:01 +0000 (-0700)
Subject: USB: sierra: add more checks on shutdown
X-Git-Tag: v2.6.22-rc1~1117^2~19
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f094e4f358c2f9f0a46dc777f64ed7794f73d283;p=linux-2.6

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>
---

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 4865aff892..644607de4c 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -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));
 	}
 }