[PATCH] drm/msm: Fix potential NULL dereference in DPU

[Jessica Zhang]

Add NULL checks in KMS CRTC funcs to avoid potential NULL
dereference.

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Jessica Zhang <jesszhan at codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c      | 8 ++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c          | 5 +++++
 drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c        | 3 +++
 drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c | 3 +++
 drivers/gpu/drm/msm/msm_gpu.c                     | 3 +++
 5 files changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
index d2457490930b..53d80572181e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
@@ -208,8 +208,16 @@ void dpu_core_irq_preinstall(struct dpu_kms *dpu_kms)
 	dpu_kms->irq_obj.total_irqs = dpu_kms->hw_intr->total_irqs;
 	dpu_kms->irq_obj.irq_cb_tbl = kcalloc(dpu_kms->irq_obj.total_irqs,
 			sizeof(struct list_head), GFP_KERNEL);
+
+	if (!dpu_kms->irq_obj.irq_cb_tbl)
+		return;
+
 	dpu_kms->irq_obj.irq_counts = kcalloc(dpu_kms->irq_obj.total_irqs,
 			sizeof(atomic_t), GFP_KERNEL);
+
+	if (!dpu_kms->irq_obj.irq_counts)
+		return;
+
 	for (i = 0; i < dpu_kms->irq_obj.total_irqs; i++) {
 		INIT_LIST_HEAD(&dpu_kms->irq_obj.irq_cb_tbl[i]);
 		atomic_set(&dpu_kms->irq_obj.irq_counts[i], 0);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 768012243b44..0a1cad0cfcc0 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -921,6 +921,11 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
 
 	pstates = kzalloc(sizeof(*pstates) * DPU_STAGE_MAX * 4, GFP_KERNEL);
 
+	if (!pstates) {
+		rc = -ENOMEM;
+		goto end;
+	}
+
 	if (!crtc_state->enable || !crtc_state->active) {
 		DRM_DEBUG_ATOMIC("crtc%d -> enable %d, active %d, skip atomic_check\n",
 				crtc->base.id, crtc_state->enable,
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
index c6b69afcbac8..09751b480db5 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
@@ -92,6 +92,9 @@ static void mdp5_plane_reset(struct drm_plane *plane)
 	kfree(to_mdp5_plane_state(plane->state));
 	mdp5_state = kzalloc(sizeof(*mdp5_state), GFP_KERNEL);
 
+	if (!mdp5_state)
+		return;
+
 	if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 		mdp5_state->base.zpos = STAGE_BASE;
 	else
diff --git a/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c b/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c
index cabe15190ec1..71e209d07120 100644
--- a/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c
+++ b/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c
@@ -170,6 +170,9 @@ void msm_disp_snapshot_add_block(struct msm_disp_state *disp_state, u32 len,
 
 	new_blk = kzalloc(sizeof(struct msm_disp_state_block), GFP_KERNEL);
 
+	if (!new_blk)
+		return;
+
 	va_start(va, fmt);
 
 	vaf.fmt = fmt;
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 8a3a592da3a4..ddd23f3a4a99 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -296,6 +296,9 @@ static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
 		state->bos = kcalloc(nr,
 			sizeof(struct msm_gpu_state_bo), GFP_KERNEL);
 
+		if (!state->bos)
+			return;
+
 		for (i = 0; i < submit->nr_bos; i++) {
 			if (should_dump(submit, i)) {
 				msm_gpu_crashstate_get_bo(state, submit->bos[i].obj,
-- 
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