disp: msm: sde: add out of bounds check for dnsc_blur & wb cache

Add bound check for number of dnsc_blur blocks, while parsing from
device tree. Fix out of bound access while setting the llcc_active
during system cache disable case in writeback.

Change-Id: I7e604db5ebfaa6e8b6f066e0f6efb76e7d78e604
Signed-off-by: Veera Sundaram Sankaran <quic_veeras@quicinc.com>

msm/sde/sde_hw_catalog.c

@@ -3377,6 +3377,12 @@ static int sde_dnsc_blur_parse_dt(struct device_node *np, struct sde_mdss_cfg *s
 	if (rc)
 		goto end;
 
+	if (off_count > DNSC_BLUR_MAX_COUNT) {
+		SDE_ERROR("invalid dnsc_blur block count:%d\n", off_count);
+		rc = -EINVAL;
+		goto end;
+	}
+
 	sde_cfg->dnsc_blur_count = off_count;
 
 	rc = _read_dt_entry(np, dnsc_blur_prop, ARRAY_SIZE(dnsc_blur_prop), prop_count,