[ACPI] Fix Null pointer deref in video/lcd/brightness
http://bugzilla.kernel.org/show_bug.cgi?id=5571 Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Yu Luming <luming.yu@gmail.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -812,7 +812,7 @@ acpi_video_device_write_brightness(struct file *file,
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ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
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if (!dev || count + 1 > sizeof str)
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if (!dev || !dev->brightness || count + 1 > sizeof str)
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return_VALUE(-EINVAL);
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if (copy_from_user(str, buffer, count))
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