disp: msm: fix out-of-bound access and NULL dereference

Fix possible out-of-bound access and NULL pointer
dereference in SDE and PLL driver.

Change-Id: Ic5c34b3b4c3e983413a0351c38206cf3f3ab3b1f
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

msm/sde/sde_encoder.c

@@ -1387,7 +1387,8 @@ static int _sde_encoder_dsc_2_lm_2_enc_2_intf(struct sde_encoder_virt *sde_enc,
 	SDE_DEBUG_ENC(sde_enc, "pic_w: %d pic_h: %d mode:%d\n",
 			roi->w, roi->h, dsc_common_mode);
 
-	for (i = 0; i < sde_enc->num_phys_encs; i++) {
+	for (i = 0; i < sde_enc->num_phys_encs &&
+				i < MAX_CHANNELS_PER_ENC; i++) {
 		bool active = !!((1 << i) & params->affected_displays);
 
 		SDE_EVT32(DRMID(&sde_enc->base), roi->w, roi->h,

msm/sde/sde_hw_catalog.c

@@ -2588,19 +2588,16 @@ static int sde_uidle_parse_dt(struct device_node *np,
 
 	if (!sde_cfg) {
 		SDE_ERROR("invalid argument\n");
-		rc = -EINVAL;
-		goto end;
+		return -EINVAL;
 	}
 
 	if (!sde_cfg->uidle_cfg.uidle_rev)
-		goto end;
+		return 0;
 
 	prop_value = kcalloc(UIDLE_PROP_MAX,
 		sizeof(struct sde_prop_value), GFP_KERNEL);
-	if (!prop_value) {
-		rc = -ENOMEM;
-		goto end;
-	}
+	if (!prop_value)
+		return -ENOMEM;
 
 	rc = _validate_dt_entry(np, uidle_prop, ARRAY_SIZE(uidle_prop),
 			prop_count, &off_count);

msm/sde/sde_hw_reg_dma_v1_color_proc.c

@@ -2267,6 +2267,7 @@ void reg_dmav1_setup_vig_igcv5(struct sde_hw_pipe *ctx, void *cfg)
 	if (!igc_lut) {
 		DRM_DEBUG_DRIVER("disable igc feature\n");
 		vig_igcv5_off(ctx, hw_cfg);
+		return;
 	}
 
 	dma_ops = sde_reg_dma_get_ops();
@@ -2317,6 +2318,7 @@ void reg_dmav1_setup_vig_igcv6(struct sde_hw_pipe *ctx, void *cfg)
 		DRM_DEBUG_DRIVER("disable igc feature\n");
 		/* Both v5 and v6 call same igcv5_off */
 		vig_igcv5_off(ctx, hw_cfg);
+		return;
 	}
 
 	dma_ops = sde_reg_dma_get_ops();

msm/sde/sde_plane.c

@@ -2818,10 +2818,7 @@ static void _sde_plane_setup_uidle(struct drm_crtc *crtc,
 		SDE_ERROR("invalid settings, will disable UIDLE %d %d %d %d\n",
 			line_time, fal10_threshold, fal10_target_idle_time_ns,
 			fal1_target_idle_time_ns);
-		cfg.enable = false;
-		cfg.fal10_threshold = 0;
-		cfg.fal1_threshold = 0;
-		cfg.fal_allowed_threshold = 0;
+		memset(&cfg, 0, sizeof(struct sde_hw_pipe_uidle_cfg));
 	}
 
 	SDE_DEBUG_PLANE(psde,
@@ -2863,6 +2860,7 @@ static void _sde_plane_update_roi_config(struct drm_plane *plane,
 	struct drm_crtc *crtc, struct drm_framebuffer *fb)
 {
 	const struct sde_format *fmt;
+	const struct msm_format *msm_fmt;
 	struct sde_plane *psde;
 	struct drm_plane_state *state;
 	struct sde_plane_state *pstate;
@@ -2875,7 +2873,15 @@ static void _sde_plane_update_roi_config(struct drm_plane *plane,
 	state = plane->state;
 
 	pstate = to_sde_plane_state(state);
-	fmt = to_sde_format(msm_framebuffer_format(fb));
+
+	msm_fmt = msm_framebuffer_format(fb);
+	if (!msm_fmt) {
+		SDE_ERROR("crtc%d plane%d: null format\n",
+			DRMID(crtc), DRMID(plane));
+		return;
+	}
+
+	fmt = to_sde_format(msm_fmt);
 
 	POPULATE_RECT(&src, state->src_x, state->src_y,
 		state->src_w, state->src_h, q16_data);
@@ -3033,6 +3039,7 @@ static void _sde_plane_update_properties(struct drm_plane *plane,
 	struct drm_crtc *crtc, struct drm_framebuffer *fb)
 {
 	uint32_t nplanes;
+	const struct msm_format *msm_fmt;
 	const struct sde_format *fmt;
 	struct sde_plane *psde;
 	struct drm_plane_state *state;
@@ -3042,7 +3049,15 @@ static void _sde_plane_update_properties(struct drm_plane *plane,
 	state = plane->state;
 
 	pstate = to_sde_plane_state(state);
-	fmt = to_sde_format(msm_framebuffer_format(fb));
+
+	msm_fmt = msm_framebuffer_format(fb);
+	if (!msm_fmt) {
+		SDE_ERROR("crtc%d plane%d: null format\n",
+			DRMID(crtc), DRMID(plane));
+		return;
+	}
+
+	fmt = to_sde_format(msm_fmt);
 	nplanes = fmt->num_planes;
 
 	/* update secure session flag */

pll/pll_drv.c

@@ -208,9 +208,12 @@ static inline int mdss_pll_get_ioresurces(struct platform_device *pdev,
 	struct resource *rsc = platform_get_resource_byname(pdev,
 						IORESOURCE_MEM, resource_name);
 	if (rsc) {
+		if (!regmap)
+			return -ENOMEM;
+
 		*regmap = devm_ioremap(&pdev->dev,
 					rsc->start, resource_size(rsc));
-		if (!regmap)
+		if (!*regmap)
 			return -ENOMEM;
 	}
 	return rc;