# Re: \[patch\] OMAPDSS: reading past end of array in dispc\_dump\_regs()

- From: Dan Carpenter \<hidden\>
- Date: 2012-12-17 12:39:19 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2012/12/13151711
- Thread: https://ratatoskr.run/linux-omap/2012/12/13151709/t.md

```text
On Mon, Dec 17, 2012 at 02:09:00PM +0200, Tomi Valkeinen wrote:
> Why does the static checker think OMAP_DSS_WB is needed in the array?

drivers/video/omap2/dss/dispc.c +3284

  3274  #define DISPC_REG(plane, name, i) name(plane, i)
  3275  #define DUMPREG(plane, name, i) \
  3276          seq_printf(s, "%s_%d(%s)%*s %08x\n", #name, i, p_names[plane], \
  3277          (int)(46 - strlen(#name) - strlen(p_names[plane])), " ", \
  3278          dispc_read_reg(DISPC_REG(plane, name, i)))
  3279  
  3280          /* Video pipeline coefficient registers */
  3281  
  3282          /* start from OMAP_DSS_VIDEO1 */
  3283          for (i = 1; i < dss_feat_get_num_ovls(); i++) {
  3284                  for (j = 0; j < 8; j++)
  3285                          DUMPREG(i, DISPC_OVL_FIR_COEF_H, j);

The logic here is that we pass i to DISPC_OVL_FIR_COEF_H() which
passes i to DISPC_FIR_COEF_H_OFFSET().  Anything higher than
OMAP_DSS_WB will trigger a BUG() in DISPC_FIR_COEF_H_OFFSET().

So it's not rock hard logic at all.

regards,
dan carpenter

```