drm: edid: Add bounds checking to HDMI VSDB parsing
The length of HDMI VSDB must be at least 5 bytes. Other than the minimum, nothing else about the length is specified. Check the length before accessing any additional field beyond the minimum length. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NAdam Jackson <ajax@redhat.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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