[patch 05/19] apci: fix NULL deref in video/lcd/brightness

[Greg Kroah-Hartman]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Yu Luming <luming.yu@xxxxxxxxx>

Fix Null pointer deref in video/lcd/brightness
http://bugzilla.kernel.org/show_bug.cgi?id=5571

Signed-off-by: Yu Luming <luming.yu@xxxxxxxxx>
Cc: "Brown, Len" <len.brown@xxxxxxxxx>
Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
Signed-off-by: Nishanth Aravamudan <nacc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxx>
---
 drivers/acpi/video.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.14.4.orig/drivers/acpi/video.c
+++ linux-2.6.14.4/drivers/acpi/video.c
@@ -813,7 +813,7 @@ acpi_video_device_write_brightness(struc
 
 	ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
 
-	if (!dev || count + 1 > sizeof str)
+	if (!dev || !dev->brightness || count + 1 > sizeof str)
 		return_VALUE(-EINVAL);
 
 	if (copy_from_user(str, buffer, count))

--
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