[PATCH] null pointer dereference in appledisplay driver

Commit 40b20c257a13c5a526ac540bc5e43d0fdf29792a by Len Brown introduced
a null pointer dereference in the appledisplay driver. This patch fixes
it.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <greg@kroah.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
index a7932a7..32f0e3a 100644 (file)
--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -281,8 +281,8 @@ static int appledisplay_probe(struct usb_interface *iface,
        /* Register backlight device */
        snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
                atomic_inc_return(&count_displays) - 1);
-       pdata->bd = backlight_device_register(bl_name, NULL, NULL,
-                                               &appledisplay_bl_data);
+       pdata->bd = backlight_device_register(bl_name, NULL,
+               pdata, &appledisplay_bl_data);
        if (IS_ERR(pdata->bd)) {
                err("appledisplay: Backlight registration failed");
                goto error;