[media] ivtvfb: Add sanity check to ivtvfb_pan_display()

Add sanity check to ivtvfb_pan_display() to ensure only valid values are used
to pan the display. Invalid values are rejected with -EINVAL

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/ivtv/ivtvfb.c b/drivers/media/video/ivtv/ivtvfb.c
index 2d5a97431c0a..5dec2e4012bd 100644
--- a/drivers/media/video/ivtv/ivtvfb.c
+++ b/drivers/media/video/ivtv/ivtvfb.c
@@ -836,6 +836,10 @@ static int ivtvfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *inf
         u32 osd_pan_index;
         struct ivtv *itv = (struct ivtv *) info->par;
 
+        if (var->yoffset + info->var.yres > info->var.yres_virtual ||
+            var->xoffset + info->var.xres > info->var.xres_virtual)
+                return -EINVAL;
+
         osd_pan_index = var->yoffset * info->fix.line_length
                       + var->xoffset * info->var.bits_per_pixel / 8;
         write_reg(osd_pan_index, 0x02A0C);