freescale DIU: bug fix: add sanity check for AOI position

AOI position cannot be negative.

Signed-off-by: York Sun <yorksun@freescale.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index d9d24938da9..fb51197d1c9 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -479,6 +479,10 @@ static void adjust_aoi_size_position(struct fb_var_screeninfo *var,
         base_plane_width = machine_data->fsl_diu_info[0]->var.xres;
         base_plane_height = machine_data->fsl_diu_info[0]->var.yres;
 
+        if (mfbi->x_aoi_d < 0)
+                mfbi->x_aoi_d = 0;
+        if (mfbi->y_aoi_d < 0)
+                mfbi->y_aoi_d = 0;
         switch (index) {
         case 0:
                 if (mfbi->x_aoi_d != 0)