From: Shailendra Verma <shailendra.v@samsung.com>
Date: Fri, 11 Nov 2016 13:35:00 +0000 (+0000)
Subject: drm/arm/malidp: Fix possible dereference of NULL
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=94d8b9b75c6118075ed54ad2fa0bea03c0f27145;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

drm/arm/malidp: Fix possible dereference of NULL

There is possible deference of NULL pointer on return of
malidp_duplicate_plane_state() if kmalloc fails. Check the
returned kmalloc pointer before continuing.

Signed-off-by: Shailendra Verma <Shailendra.v@samsung.com>
[cleaned up the code and re-formatted the commit message]
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
---

diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
index eff2fe47e26a..d1cc15724dc3 100644
--- a/drivers/gpu/drm/arm/malidp_planes.c
+++ b/drivers/gpu/drm/arm/malidp_planes.c
@@ -67,13 +67,14 @@ drm_plane_state *malidp_duplicate_plane_state(struct drm_plane *plane)
 		return NULL;
 
 	state = kmalloc(sizeof(*state), GFP_KERNEL);
-	if (state) {
-		m_state = to_malidp_plane_state(plane->state);
-		__drm_atomic_helper_plane_duplicate_state(plane, &state->base);
-		state->rotmem_size = m_state->rotmem_size;
-		state->format = m_state->format;
-		state->n_planes = m_state->n_planes;
-	}
+	if (!state)
+		return NULL;
+
+	m_state = to_malidp_plane_state(plane->state);
+	__drm_atomic_helper_plane_duplicate_state(plane, &state->base);
+	state->rotmem_size = m_state->rotmem_size;
+	state->format = m_state->format;
+	state->n_planes = m_state->n_planes;
 
 	return &state->base;
 }