USB: isight: fix kernel bug when loading firmware

BugLink: http://bugs.launchpad.net/bugs/915926

commit 59bf5cf94f0fa3b08fb1258b52649077b7d0914d upstream.

We were sending data on the stack when uploading firmware, which causes
some machines fits, and is not allowed.  Fix this by using the buffer we
already had around for this very purpose.

Reported-by: Wouter M. Koolen <wmkoolen@cwi.nl>
Tested-by: Wouter M. Koolen <wmkoolen@cwi.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Brad Figg <brad.figg@canonical.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/usb/misc/isight_firmware.c b/drivers/usb/misc/isight_firmware.c
index fe1d44319d0..8f725f65191 100644
--- a/drivers/usb/misc/isight_firmware.c
+++ b/drivers/usb/misc/isight_firmware.c
@@ -55,8 +55,9 @@ static int isight_firmware_load(struct usb_interface *intf,
 
         ptr = firmware->data;
 
+        buf[0] = 0x01;
         if (usb_control_msg
-            (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\1", 1,
+            (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1,
              300) != 1) {
                 printk(KERN_ERR
                        "Failed to initialise isight firmware loader\n");
@@ -100,8 +101,9 @@ static int isight_firmware_load(struct usb_interface *intf,
                 }
         }
 
+        buf[0] = 0x00;
         if (usb_control_msg
-            (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1,
+            (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1,
              300) != 1) {
                 printk(KERN_ERR "isight firmware loading completion failed\n");
                 ret = -ENODEV;