linux-kernel - [PATCH] drm/arm/mali: potential dereference of null pointer

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Message-Id: <20211214100000.23395-1-jiasheng@iscas.ac.cn>
Date:   Tue, 14 Dec 2021 18:00:00 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     liviu.dudau@....com, brian.starkey@....com, airlied@...ux.ie,
        daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] drm/arm/mali: potential dereference of null pointer

The return value of kzalloc() needs to be checked.
To avoid use of null pointer '&mw_state->base' in case of the
failure of alloc.

Fixes: 8cbc5caf36ef ("drm: mali-dp: Add writeback connector")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/gpu/drm/arm/malidp_mw.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
index f5847a79dd7e..612d386ee7d2 100644
--- a/drivers/gpu/drm/arm/malidp_mw.c
+++ b/drivers/gpu/drm/arm/malidp_mw.c
@@ -70,7 +70,11 @@ static void malidp_mw_connector_reset(struct drm_connector *connector)
 		__drm_atomic_helper_connector_destroy_state(connector->state);
 
 	kfree(connector->state);
-	__drm_atomic_helper_connector_reset(connector, &mw_state->base);
+
+	if (mw_state)
+		__drm_atomic_helper_connector_reset(connector, &mw_state->base);
+	else
+		__drm_atomic_helper_connector_reset(connector, NULL);
 }
 
 static enum drm_connector_status
-- 
2.25.1